Vanilla slices Recipe from Edwardian 1909.
Take one pound of flour, half a pound of lard. Rub the lard in the flour, and mix to a fairly stiff paste with cold water. Divide the paste into two equal parts, roll each one about eight inches long and four inches wide, and bake in a hot oven. When baked, and gone quite cool, sandwich together with the following mixture, one ounce of corn flour, three ounce of castor sugar. Place in a brass pan, and beat well together with one egg, then add a cupful of milk, and boil till it becomes the consistency of thick cream, and a drop or two of essence of vanilla. When you have sandwiched them together, run a little water icing over the top, and cut in little slices about an inch thick.