This comes from one of my favorite picture books by Patricia Polacco of the same name. I've made it with my classes and my own kids on a stormy day. The tomato puree may sounds weird, but it just adds a zip and you'd never guess it was in there. Thunder Cake! Pre-heat oven to 350 degrees. Cream together one at a time: 1 cup shortening 1 3/4 cup sugar 1 teaspoon vanilla 3 eggs, separated ( blend yolks in. Beat whites until they are stiff, then fold in.) 1 cup cold water 1/3 cup pureed…