2To Make Cookies: Cream together 2 cups sugar, 1/2 cup shortening and 2 eggs.
3Sift together 4 cups flour, baking soda, baking powder, 1 1/2 teaspoons salt and cocoa. Add alternately the flour mixture to the creamed mixture with boiling water and 1 teaspoon vanilla.
4Drop teaspoons sized pieces of dough onto greased cookie sheet. Bake 5 to 7 minutes.
5To Make Filling: Cook 5 1/2 tablespoons flour and 1 cup milk until thick. Let cool. Cream 1 cup shortening, 1 cup sugar, 1/4 teaspoon salt, and 1 teaspoon vanilla. Add cooled flour mixture. Beat till creamy.
6Spread on the flat side of a cooled cookie and sandwich together with another cookie.