Mix the sugar and eggs until frothy, stir in the yoghurt, mix in the salt and baking soda mixed with the buckwheat flour, the dough should still be thick.
Grease a large quiche or springform pan (or baking dish) thoroughly with butter, distribute the fruit evenly in it and pour the batter over it. Bake at about 175 ° for about 1/2 hour.
Let cool a little and dust with powdered sugar.
It tastes best when it is still lukewarm, served with vanilla sauce, ice cream or cream as a dessert or with coffee.
Tip:
Also tastes delicious with berries or other fruits.