Cream the butter and sugar together and add the egg. Sieve the flour, cocoa powder and slat together and work into the butter mixture. Knead the dough and roll it out between two sheets of wax paper. Cut out rectangles, about 1 1/4 by 2 3/4 inches. Mark a line across the center of the biscuits using a skewer. Bake the cookies on a greased cookie sheet for 10 to 15 minutes. Cool on a wire rack. Frosting: Soften butter and beat in the frosting sugar. You may need to add a few drops of hot water if the frosting is too firm. Add vanilla to taste. If you want to sandwich the cookies together, so with a little of the butter frosting. Decorate the top of the dominoes with dots (they should all have a line across the middle), using a pastry bag fitted with a plain tip. Yield: Approximately 14
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