You will need a kitchen scale.

Weigh three eggs then break into a mixing bowl. Add the same weight of sugar and beat this into the eggs until light and fluffy. Weigh an equivalent weight in flour. Stir 2 teaspoons of baking powder into the flour until well mixed.

Stir the flour mixture into the butter and eggs, stirring just until mixed. Stir in 1 stick (1/4 lb) melted butter.

Pour into a greased and floured 9x13-inch baking pan. Cut plums in half and lay halves on top of mixture, with the cut side of plums facing up. Sprinkle with cinnamon and sugar.

Bake at 350°F until a toothpick or cake tester inserted in center of cake comes out clean.

The recipe may be halved or doubled.

If the cake is large, reduce temperature of oven and bake for a longer time, if the cake is small, raise the oven temperature and bake for less time. The recipe above which uses 3 eggs will take approximately 30 minutes.

Other fruit may be used, such as peaches, apples, pineapple or mixed fruits.