Preserved in White House files, the recipe has been used by many another First Lady, right up to our day...
Beef drippings (or lard)
Mix 1 cup molasses (Dolley's "receipt" specified New Orleans molasses) with 2/3 cup fresh beef drippings. Add 1 1/4 teaspoons baking soda disspoved in 1/4 cup hot water. Sift your dry ingredients: 2 1/4 cups flour, 4 teaspoons ginger, and 1 tablespoon cinnamon. Next pour 3/4 cup hot water which has almost reached the boiling point into the molasses mixture alternately with the flour mixture. Beat thoroughly with a rotary or electrib beater. The dough should be soft enough to pour. Bake in a shallow, well-breased baking dish in a preheated medium (350 degrees F.) oven 25 to 30 minutes, or until a toothpick inserted in the center of the cake comes out clean. Delicious served warm, sprinkled with powdered sugar."
---Presidents' Cookbook (p. 90)