This simple French classic cake is made from a recipe in the cookbook GATEAU The Surprising Simplicity of French Cakes by Aleksandra Crapanzano. It is the first recipe in the book, said to be a cake that "every child in France learns this recipe in nursery school, as it could not be easier to make." The French yogurt is sold in half-cup jars and the jar is used as the measuring cup. The simplicity lies in the repetition of 1-2-3, then 1-2-3 for the ingredients. Easy to remember.