Definition: Sifting is a process of forcing flour and other dry ingredients through a fine mesh to break up any lumps and to aerate the ingredients.
When It’s Used: Sifted flour is much lighter and incorporates into a batter or dough more easily. Flour and other dry ingredients should be sifted when making light and tender baked goods, such as cakes and delicate pastries. Ingredients that tend to clump, like powdered sugar and cocoa powder, should also be sifted.
Tips for Sifting: If measuring by volume, ingredients should always be sifted after they are measured (unless otherwise specified by the recipe) because the ingredient will increase in volume after sifting.