Plum cake

My pear cake recipe (here) works well with other fruits. Tonight, my daughter and I made a plum version of this cake with the following proportions:

• 5 ripe plums


• 4 eggs


• 180g (less than 1 cup) sugar


• 1 stick (114g) butter


• 170g (about 1 1/3 cups) flour


• 1 tsp baking powder


• 1 tsp vanilla extract


• 1/2 tsp ground cinnamon

We beat the eggs and sugar until foamy. We added the melted butter, then the sifted flour, then the baking powder, vanilla extract, and cinnamon, mixing well (with a whisk) while adding each ingredient.
We poured the dough in a buttered, round metal pan (the same old 10" x 2" I used in the pear cake recipe).
We placed the plums, halved and pitted, on the dough, cut side up.
We baked for about 50 minutes in a  340ºF oven.