Wash the plums, cut them in half, and remove the pits.

In a saucepan, bring 1/2 cup water (100 ml) and 1/3 cup sugar (75 grams) to a boil. Add the plums and simmer for 5 minutes. Drain the plums, reserve the syrup, and let both cool.

Place the plums in a greased baking dish.

In a mixing bowl, combine the flour, cornstarch, eggs, a pinch of salt, sugar, melted butter, and warmed milk. Mix until smooth.

Bake for 35 minutes at 400°F (200°C) without preheating the oven.

When the cake is done, pour the reduced syrup over the top.