Filling for Mocha cake
Thicken a cupful of scalding milk with a tablespoonful of cornstarch wet with a little cold milk. Stir over the fire until smooth, then pour gradually on the yolks of three eggs that have been beaten light with a half cupful of sugar. Stir over the fire for three minutes, and set aside until almost cold, when beat in a gill of strong black coffee. Spread upon the cake layers.