Fat washing is the technique that turned bacon-infused bourbon from a novelty into a serious bartending tool. It is the process of infusing a fat — butter, bacon drippings, olive oil, brown butter, even foie gras — into a spirit, then removing the fat itself while keeping its flavor behind. What is left is a spirit that tastes unmistakably of the fat that touched it, with none of the greasy texture.
The technique dates back further than craft cocktail bars would have you believe. Milk punches and clarified fat infusions appear in 18th century English drinking manuals, but the modern fat-washing renaissance is usually traced to bartender Don Lee, who popularized bacon-washed bourbon at PDT in New York in the mid-2000s. Since then it has become a standard tool for any bar serious about flavor.
The Science of Why It Works
Fat washing relies on a basic principle of chemistry: many flavor compounds are fat-soluble rather than water-soluble. When you melt a fat and stir it into a spirit, the fat-soluble aromatic compounds — the smoky, savory, nutty notes that make bacon taste like bacon — migrate out of the fat and bind to the alcohol molecules around them.
Alcohol is an excellent solvent for both fat-soluble and water-soluble compounds, which is exactly why this works. Once the flavor has transferred, you freeze the mixture. Solid fat is far easier to separate from liquid than melted fat — freezing causes the fat to solidify into a hard cap or scattered solids, while the spirit (which has a much lower freezing point thanks to its alcohol content) stays liquid. Strain, and the fat comes out. The flavor compounds, now dissolved in the alcohol, stay in.
The result: a spirit that tastes like the fat smells, with a silkier mouthfeel than the unwashed spirit, but none of the actual oil left to coat your glass.
What You'll Need
- A fat. Rendered bacon fat, brown butter, toasted coconut oil, olive oil, and duck fat are the most common starting points. Use a fat with a flavor you actually want in the final drink.
- A base spirit. Bourbon and rye are classic with bacon and brown butter. Tequila pairs beautifully with toasted coconut oil. Gin works with olive oil. Rum loves brown butter.
- A heatproof, freezer-safe container with a tight lid.
- Cheesecloth or a coffee filter for the final strain.
- A funnel and bottle for storage.
The Method
- Melt your fat completely. If using bacon, render the fat slowly so it doesn't scorch — burnt fat means burnt flavor in your spirit. Let it cool slightly so it's warm, not hot.
- Combine the melted fat with your spirit in a ratio of roughly 1 part fat to 8–10 parts spirit. For a 750ml bottle, that's about 75–90ml of fat.
- Seal the container and shake to fully combine, then let it sit at room temperature for 4–8 hours, shaking occasionally. Some bartenders skip the room-temperature infusion and go straight to freezing, but a short infusion period gives the fat-soluble compounds more time to migrate before they solidify.
- Transfer to the freezer overnight. The fat will rise and solidify into a hard layer or disperse into solid chunks, depending on the fat used.
- Remove from the freezer and break through the solid fat cap with a spoon or knife.
- Strain through cheesecloth into a clean container, then strain again through a coffee filter for full clarity. Discard the fat.
- Bottle and label. Fat-washed spirits keep for several weeks refrigerated, though most bartenders use them within two weeks for the freshest flavor.
Where It Belongs
Fat-washed bourbon is the obvious entry point — bacon-washed bourbon in an Old Fashioned is the technique's signature move, and for good reason. The smoky, savory depth plays directly into the drink's existing profile. But don't stop there. Brown-butter-washed rum in a Daiquiri variation adds a toasted, nutty roundness that citrus alone can't deliver. Olive-oil-washed gin turns a Martini into something closer to a very good olive brine, in the best way.
The rule of thumb: fat washing works best in stirred, spirit-forward drinks where the washed spirit is the star, not buried under competing flavors. Save it for cocktails built to show it off.
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