Put the flour in a large bowl, make a well in the middle, crumble the yeast into it, pour 1 teaspoon of sugar and 5 tablespoon of milk over it, leave to rise to the pre-dough for about 10 minutes. Then knead well with all the other ingredients, roll out on a prepared baking sheet or in a form (20 cm).
Spread the cream for the topping on the floor, cover with halved plums. Bake in a preheated oven at 160 ° for about 15 minutes, then remove the tray and quickly sprinkle the crumble on top. Bake for another 15 minutes and sprinkle with icing sugar when cold.
Prepare the cream:
Mix the egg yolks with the sugar until they are very creamy, then stir in the buttermilk and coconut flakes.