Lecithin by John Spottiswood.

Derived from soy beans or egg yolks, nutrient-rich lecithin is a wonder ingredient. It's used in cooking as an emulsifier, preservative, lubricant, and moisturizer. It's a healthful substitute for fat in baked goods, adding moisture and improving texture. Bakers use it as a dough enhancer because it helps give yeast breads more of a rise. It comes either granulated or as a liquid.