1. Toss the plums with the plum brandy or kirsch and 2 tablespoons of the sugar in a bowl. Let sit 30 minutes to an hour, tossing from time to time. Meanwhile, preheat the oven to 375 degrees F. Butter a 10- or 10-1/2-inch ceramic tart pan or clafoutis dish.

2. Drain the liquid from the plums and beat together with the milk and yogurt. Beat the eggs with the seeds from the vanilla bean or the vanilla extract in the bowl of an electric mixer, or with a whisk, until smooth. Add the remaining white sugar and the salt. Beat together. Slowly beat in the flour, then the milk and/or yogurt. Mix together well. The ingredients can also be combined in a blender and mixed at high speed.

3. Arrange the plums in the baking dish, rounded side up. Pour in the batter.

4. Bake in the preheated oven for 35 to 45 minutes, until the top is browned and the clafoutis is firm. Press gently on the top in the middle to see if it's firm. If it isn't, return to the oven for about 5 minutes. Remove from the heat and cool slightly on a rack. Place 2 to 3 teaspoons of powdered sugar in a strainer and tap it above the clafoutis to dust. Serve warm.