Fat Wash. A step by step guide on Fat Washing.

how to fat wash.

Fat washing was first brought to the wider public’s attention by a bartender called Don Lee. He was working at Please Don’t Tell in New York at the time and spent a lot of time talking to chefs trying to gain inspiration for where to go next with his drinks. It was one of these chefs, who had heard of a technique that perfumers use to extract difficult flavours, that inspired him to fat wash bourbon with bacon. With fat washing, flavour options are very much verging on limitless for bartenders

fat wash infusion in glass jar
photo credit: the flavour bender

What is Fat Washing?

Over the past decade, this process has gone from relative obscurity to a regular practice in most cocktail bars. Although it can sound disgusting and can be tricky to make, the results are fantastic and tasty. This rather odd technique comes from a old process named enfleurage which perfumers have used since the 19th century to extract essential oils.

Water is known in the world of science as a universal solvent. This basically means it dissolves more substances than any other liquid. Due to the positive charge of hydrogen molecules on one side, and negative charge of oxygen molecules on the other, the flavour and aroma compounds become attracted to water and bond readily. 

Oil, however, has a neutral charge. It doesn’t attract charged particles so won’t dissolve as wide a range of solutes as water. But it more readily bonds with other neutral molecules meaning it will take on more flavour of certain solutes. Oil also already has its own flavour, so the flavour of the solute has to pair with the flavour of the oil.

Fat washing is entirely possible due to alcohol’s capability to dissolve oil-based molecules.

When using oil, you must be particularly careful of potential bacterial growth — poorly stored or incorrectly made infusions can cause Botulism, which can have potentially fatal side effects.

Jump to Recipe

History of Fat Washing

Like we mentioned previously, the process of using fat to extract flavour dates back to perfumers during the 19th century however it is Don Lee of New York’s Please Don’t Tell (PDT) we have to thank for bringing it to the mainstage of the bar world. Don Lee created the Benton’s Old-Fashioned, a bacon-infused bourbon cocktail.

Don credits his inspiration for fat washing to Eben Freeman, another New York bartender of the popular WD-50 bar. Eben is known for his brown butter washed rum which he learned from the pastry chef at the time, Chef Sam Mason.

Types of Fat for Fat Washing

All oils are soluble in alcohol. There is very little difference in terms of how well an oil/fat combines with your spirit. Different products though will give different flavours and the oil you choose must pair with the cocktail concept you are trying to create as much as the base alcohol.

If you go along the lines of natural food pairings or when certain drinks/foods are traditionally eaten, you won’t stray too far wrong.

Think extra virgin olive oil for a tomato-based or green herb inspired drink. Although you may find some strange matches, you will see later that the use of coconut oil is more suited to Calvados! As we have used in our coconut sidecar.

Choosing an oil with a higher melting point will aid in removing the oil once it is frozen. Another thing to think about is the taste factor.

Many oils already have a distinct flavour, but you can also opt for others that are neutral, giving you the option to add additional flavours. Below are some examples of their melting points.

Oil Typemelting point
Olive Oil21°F (-6°C)
Sesame Oil21°F (-6°C)
Peanut Oil37°F (3°C)
Coconut Oil77°F (25°C)
Palm Oil95°F (35°C)
Cocoa Butter93 to 100°F (34 to 38°C)
Butter90 to 95°F (32 to 35°C)
Melting points of various oils

How to Fat Wash

Fat washing is certainly a lengthy process but the results are worth it. Make sure your fat/ oil is in liquid form before use. For each recipe, there might be a bit of experimentation to get it to the taste you want but we recommend these ratios which are from Dave Arnolds Liquid Intelligence book.

120g/4 oz per 750ml for strong tasting fats luck bacon and duck fat and 240g/8 oz for less strong fats like butter and vegetable oils.

The following are generic instructions for fat washing alcohol which can be adapted to any spirit and fat combination. The ratios can be scaled down if you plan to use smaller quantities.

How to Fat Wash Alcohol

In order to fat wash your chosen alcohol, you need to first transform your chosen fat or oil into a liquid form and combine it with the alcohol.


  • pan for melting nonliquid fat
  • Nonreactive container
  • fine strainer
  • cheesecloth or coffee filter
  • funnel
  • bottle for storage


  • In order to fat wash your chosen alcohol, you need to first transform your chosen fat/ oil into a liquid form and combine it with the alcohol. We suggest a microwave for 30 seconds if you are using a fat with a higher melting point.
  • Take care at this stage if you’ve had to use heat to melt your fat not to add it to the alcohol while it’s very hot.
  • in a plastic tub, add your fat, alcohol and any other ingredient you are using.
  • Once combined stir and leave to stand for around 6 hours at room temperature. This allows the alcohol to start to dissolve a few of the oil molecules and helps it retain the flavour.
  • The next step is to freeze the solution. Leave it in the freezer overnight or for up to 6 hours. This causes the fat to solidify and float to the top, as alcohol has a very low freezing point it will stay as a liquid.
  • Once separated, it is possible to skim the fat off the top and then strain the liquid through a cheesecloth.

Fat Washing with Olive Oil

Olive oil is produced by pressing whole olives, a tree crop found in the Mediterranean Basin. It is one of the core food plants found in Mediterranean cuisine and interestingly Spain is the largest producer by volume.

Olive oil composition can vary depending on altitude, time of harvest and other factors and Extra Virgin Olive is considered to have more favorable flavour characteristics.

One of the common olive oil fat wash is to use vodka to max out your dirty martini recipe! The dirty martini calls for olive brine but why not added an extra depth and sily texture of the green little fruit.

We also use olive oil with egg white in one of our shrub cocktails to add a silky texture and match our strawberry and basil flavours.

Fat Washing with Sesame Oil

Sesame oil has a distinct nutty aroma and taste and can be found in different colours. The dark brown variety found in East Asia is from roasting the sesame seeds before pressing. Lighter colours are not roasted before hand and come from the raw seed so the flavour is different.

Experiment to find which one matches your needs. We recommend pairing it with a grain whiskey like Nikka from the barrel or Suntory hakushu whiskey.

Fat Washing with Coconut Oil

Coconut oil has a long standing history in the Asian culinary scene though due to its high levels of saturated fat it gets a bad rap. harvested from the coconut palm, you will usually find it in solid form sue to its high melting point.

Because of its high saturated fat content, it is resistant to rancidification usually caused by fast oxidisation and can last up to 6 months at controlled temperatures.

We like to use this with a young Calvados because the crips apple notes pair so wonderfully with the nutty and creamy coconut notes. Then we whip it all up in a sidecar recipe.

How to Fat Wash with Peanut Butter

The process of using peanut butter for a fat wash is more associated with enfleurage than its vegetable and animal oil counterparts. Using a large baking pan, spread a thin layer of peanut butter over the pan and pour your chosen alcohol on top.

We recommend a bourbon here like, Buffalo Trace. Let it sit at room temperature overnight and then strain off through a coffee filter in the morning. Nico De Soto, the owner of renowned bars Mace, Danico, and Kaido uses fat washing often and has been known to use peanut butter in his cocktails! You can listen about his infusion methods on our podcast ‘On the Back Bar’.

How to Fat Wash with Butter

Butter is a water-oil emulsion using milk proteins as the emulsifier. The dairy product is most frequently made from cows milk and the consistency is around 80% butterfat. Butter Rum is by far one of the tastiest options here!

When making your butter rum, remember that once your butter is melted it will contain milk solids as well as fat. The fat will give you the buttery flavour and the milk solids will give you creaminess. what does this mean for you fat wash?

Well, using the fat wash method above will result in a cloudy yet creamy spirit. Another option is to heat the butter on a stove to the point where all liquid has evaporated then add to the rum. This will give you a clearer spirit but less of the creamy taste.

How to Fat Wash with Bacon

Bacon and Bourbon is that dream worthy combination that started the trend.

Fat-washing is tastier than it sounds. An easy (but impressive) way to create savory, silky flavored spirits, the process is very similar to infusing a spirit with fruits or herbs. The only difference is that you are using fats like oil or butter or lard, so the liquor extracts and absorbs both water- and fat-soluble compounds. The fat-soluble compounds alter not only the flavor of the spirit, but also the mouthfeel.

So grab that can of bacon fat you keep in your freezer and try this super simple technique yourself—you’re five steps away from a delicious bottle of fat-washed goodness.

How to Fat Wash with Duck Fat

Duck fat has a great flavour and we recommend using it with its classic flavour counterpart, orange. Pick a bottle of Cointreau or Mandarine Napoleon to wash. When choosing your duck fat opt for pure rendered and heat it to liquid form before adding to your spirit. About 4 0z will be enough and you can leave it for around 6 hours to let it develop. After this, place in a freezer overnight and strain in the morning!

How to Store Your Fat Wash

Using fats, especially from an animal, there runs the risk of bacterial build-up. We suggest when using animal fat to make sure it has been cooked properly and you use minimal amounts.

Strain off as much of the remnant as you can which can usually mean just 2 – 3 strains through cheesecloth or coffee filter.

Store you fast washes in the fridge and we suggest any fat washed alcohol with animal fat should be used in a couple of days and vegetable fat washed alcohol can be kept for up to 2 weeks.

It might not seem like a lot of time but it’s better to be safe than sorry!

We use this pack of 1 liter Kilner bottles for all our infusion making as they are sturdy and perfectly stackable in the fridge.

Fat Wash Recipes

In our Cocktail Recipes at Home E-book, we listed a number of homemade syrups, shrubs, and infusions. Below is one of our favorite Shrub’s from the book, which is delicious and super easy to make!


“Join Christopher Menning and Horace Buckenham, bartending duo on their discovery into homemade ingredients. The mixology team behind Gastronomer Lifestyle gives you 50 drink recipes you can make at home with a focus on homemade. This book covers syrups, shrubs, fat washes and alcohol infusions giving you the basic understanding needed to make them yourself.

Rocket Rapeseed Fat Washed Mezcal

Rocket Rapeseed Mezcal

Course: fat washDifficulty: Difficult


Prep time


Shelf Life



This can be a lengthy process, but the rewards are worth it. Rocket (Eruca Sativa) also commonly known as arugula is a leafy vegetable that has been cultivated since Roman times in the Mediterranean. It has a pungent, peppery taste and every part of the plant is edible, including its seeds and flowers. It is a member of the Brassicaceae family alongside Rapeseed. Rapeseed (Brassica Napus) is grown worldwide with Canada being the largest producer. In Europe, it is grown in between cycles of wheat and barley over winter to aid in pest control. The oil has a slightly vegetal taste, great for the earthy notes found in Mezcal. 


  • 700ml Mezcal 

  • 200g rocket

  • 250ml rapeseed oil


  • Place 100g of rocket leaves into a mason jar or Tupperware container with the bottle of Mezcal.
  • Shake and seal leaving it for 3 to 4 days in a dark cool space.
  • Do exactly the same process for rapeseed oil in a separate container.
  • Once both are ready, strain both liquids into another container being sure to remove all of the rocket leaves.
  • Seal and shake and leave to stand for 6 hours.
  • Freeze overnight or until the oil has solidified at the top. 
  • Strain through a muslin cloth at least 3 times before finally transferring your product in a clean vessel

Time to Drink!

We suggest using your fat wash in a spirit-forward cocktail. Drinks like the old fashioned, Manhattan or negroni will let your wash shine. The flavour tends to be subtle so you don’t want to mask it with acidity. Experiment though and you can find some pretty bizarre yet tasty concoctions!

Cocktail Recipe

Rocket Mezcal Julep

This cocktail was created by our Gastronomer Mixologists for a luxury hotel in the UK and was met with great enthusiasm! We wanted to bring their stunning 1-acre walled kitchen garden inside a cocktail. But we also wanted to be sustainably minded so we decided on a julep cocktail with vegetables being the star.

In a classic julep cocktail, you would add a handful of mint every time but in this instance, we have infused our spirit with the rocket herb meaning there is no need to add more.


  • 50ml Rocket and Rapeseed Mezcal 

  • 40ml beetroot juice

  • 20ml Cynar 

  • 15ml lime juice 

  • 10ml orgeat 


  • Add all ingredients to your shaker and shake.
  • Strain into a julep cup over ice.
  • Cap with crushed ice and serve. 

Serve: over ice

Glass: Julep cup

what is fat washing?

Fat washing is a technique used by bartenders to add flavour from certain oils or animal fats to alcohol. the process is achieved by mixing liquid oil/ fat with alcohol and then adding the mix to the freezer overnight. the fat will have solidified but the alcohol will still remain in liquid form making it easy to strain off.

How to fat wash?

fat washing is the process of mixing oil/fat with a chosen alcohol. The first step is to turn your oil/fat to liquid form and then combine it with the alcohol in a nonreactive container. let it sit for 6 hours and then place in the freezer overnight. in the morning strain off the resulting liquid through a coffee filter or muslin cloth.

how to fat wash bourbon with bacon?

add 4oz of liquid bacon fat to 70cl of bourbon and combine it in a non-reactive container. let it sit for 4 hours and then place in a freezer overnight. in the morning strain off the resulting liquid through a coffee filter or muslin cloth.

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