Aquafaba is the starchy liquid left over from cooking chickpeas or from a can of chickpeas, and it’s used primarily as an egg replacement in vegan and allergy-friendly cooking. It foams like egg whites, emulsifies like egg yolks, and adds body to everything from meringues to cocktails, all while contributing almost no calories or flavor of its own.
Why It Works Like Eggs
The name “aquafaba” literally translates to “bean water,” but what’s in that water is more interesting than it sounds. As chickpeas cook, proteins, carbohydrates, natural soap-like compounds called saponins, and other molecules leach into the surrounding liquid. These proteins have a useful split personality: part of each molecule is attracted to water while the other part repels it. That’s exactly the same property that makes egg whites foam when you whip them. The proteins migrate to the boundary between air and liquid, forming a flexible film around tiny air bubbles and holding them in place.
The same chemistry works in emulsions. When you blend aquafaba with oil, its proteins cluster at the boundary between oil and water droplets, lowering the tension between the two and keeping them from separating. Polysaccharides in the liquid thicken the surrounding water phase, which slows the oil droplets from merging back together. The result is a stable, creamy mixture that holds for days.
Egg Replacement Ratios
Swapping aquafaba into recipes is straightforward once you know the measurements:
- 1 whole egg: 3 tablespoons aquafaba
- 1 egg white: 2 tablespoons aquafaba
- 1 egg yolk: 1 tablespoon aquafaba
These ratios work for most baking recipes. For dishes where eggs serve a binding role (cookies, quick breads, pancakes), aquafaba performs well. Where eggs provide major structural lift or richness, like in custards or quiches, results can be less predictable.
Meringues and Whipped Desserts
Meringues are aquafaba’s signature trick. You whip the liquid on high speed, just as you would egg whites, until it transforms into glossy, stiff peaks. The process takes longer than with eggs: expect 10 to 15 minutes of continuous beating. Adding a small amount of cream of tartar at the start stabilizes the foam, the same technique used with traditional egg white meringues. From there, you fold in sugar gradually and bake as usual.
Beyond meringue cookies, this foaming ability opens the door to mousses, marshmallows, pavlovas, nougat, and whipped cream alternatives. Aquafaba-based whipped toppings hold their shape when chilled, though they tend to deflate faster than dairy whipped cream at room temperature. Keeping them cold until serving helps.
Mayonnaise, Aioli, and Other Emulsions
Aquafaba makes a convincing base for vegan mayonnaise. You blend it with oil, acid (lemon juice or vinegar), and seasonings, and the proteins and polysaccharides stabilize the emulsion. Lab research comparing aquafaba mayo to traditional egg-based mayo found that the aquafaba version produces larger oil droplets and a slightly less stable emulsion over time, but for home use, the texture and flavor are close enough that many people can’t tell the difference in a blind taste test.
The same principle applies to aioli, salad dressings, and dairy-free butter. In any recipe where egg yolk or whole egg acts as the glue holding fat and water together, aquafaba can step in. The results hold well for about a week in the fridge.
Cocktails and Beverages
Bartenders have adopted aquafaba as a vegan alternative to egg whites in classic cocktails like whiskey sours, gin fizzes, and pisco sours. Egg whites traditionally create the silky foam cap on these drinks, and aquafaba does much the same. It adds body to otherwise thin cocktails and produces that characteristic frothy layer on top without the raw egg taste or food safety concerns.
The typical amount is about half an ounce (1 tablespoon) per drink, shaken hard with ice. Because aquafaba is nearly flavorless, it doesn’t compete with the spirits or citrus in the glass. It’s become common enough that many cocktail bars now keep a can of chickpeas behind the bar specifically for this purpose.
Canned vs. Homemade Aquafaba
The easiest source is a standard can of chickpeas. Just drain the liquid into a bowl and it’s ready to use. Most canned chickpea liquid has the right concentration of proteins and starches to foam and emulsify without any adjustments.
You can also make aquafaba from dried chickpeas by cooking them in water, then saving the cooking liquid. Homemade versions sometimes need to be simmered down (reduced) on the stove until the consistency resembles that of canned liquid, roughly the viscosity of thin egg whites. If it’s too watery, it won’t whip properly.
Chickpeas are the most common source, but aquafaba works from other beans too. White beans and red beans produce functional aquafaba, though chickpea liquid tends to have the mildest flavor. If you’re making something delicate like meringue, chickpea aquafaba is the safest bet.
Nutrition and Storage
Aquafaba is almost nutritionally empty, which is actually part of its appeal. One tablespoon contains roughly 3 to 5 calories, with trace amounts of protein, carbohydrates, and fat. It has essentially no vitamins or minerals. This makes it useful when you want the functional properties of eggs without the calories, cholesterol, or allergens.
Canned aquafaba keeps for up to five days in the refrigerator after opening. Homemade versions are best used within 12 hours when refrigerated, since they lack the preservatives in canned products. Both types freeze well: pour aquafaba into ice cube trays, freeze, then transfer the cubes to a bag. They’ll last for months and thaw quickly when you need them. Measuring into tablespoon portions before freezing makes it easy to grab exactly the amount a recipe calls for.