An egg foam is a mixture of eggs or egg components that has been whipped to incorporate air. Proteins in the egg help form a structure around the air bubbles, creating volume and a lighter texture. Egg foams are used to leaven or lighten cakes, soufflés, mousses, meringues and custards.
Whisking introduces air and partially unfolds egg proteins, which help stabilize bubbles. The foam becomes finer and more voluminous as whipping continues. Sugar can help stabilize some foams but may slow their initial formation. Acid, temperature, bowl cleanliness and the presence of fat or yolk also affect performance.
Grease or traces of yolk can interfere with egg-white foaming. Underwhipping produces insufficient structure, while overwhipping can make a foam dry and difficult to incorporate. Rough folding can deflate the air that the foam is intended to provide.
Chef’s tip: Use a clean, grease-free bowl for egg whites and add sugar gradually when the recipe specifies a meringue. Fold the finished foam into the base in stages, using a light hand to preserve volume.
Egg foam is a physical source of aeration: air is incorporated by whipping. Baking powder and baking soda are chemical leaveners that produce gas through chemical reactions. Some recipes use both methods.
Key distinction: An egg foam is an aerated egg mixture; meringue is a specific preparation made primarily from whipped egg whites, usually with sugar.
This term is one of hundreds covered in depth across OCS courses, learning paths, and 1-on-1 coaching with Chef Eric.
