For the short pastry, mix flour, sugar, salt, eggs and butter to a smooth dough. Cover and chill for 1 hour. Wash, halve and stone the plums. Separate the eggs. Stir egg yolk and sugar until creamy.
Mix quark, oil, pudding powder, lemon juice and zest until smooth. Stir in egg yolk-sugar mixture. Beat the egg whites until stiff and fold into the quark mixture. Roll out the shortcrust pastry on a greased fat pan of the oven. Mix almonds and cinnamon and sprinkle on the shortcrust pastry base. Spread half of the plums on top. Pour curd mixture over it and smooth it down. Place the remaining plums on the quark mixture. Bake in the preheated oven (electric: 175 °C/ gas: level 2) for 70-80 minutes. For the crumbles, melt butter and let it cool down.
Pour curd mixture over it and smooth it down. Place the remaining plums on the quark mixture. Bake in the preheated oven (electric: 175 °C/ gas: level 2) for 70-80 minutes. For the crumbles, melt butter and let it cool down. Knead flour, sugar and butter and make crumbles. Spread the butter crumbles on the plum cake about 30 minutes before the end of the baking time. Results in approx. 24 pieces