Wash the plums, drain, stone and dice them. Melt 75 g butter. Mix cinnamon and 100 g sugar
Mix flour and baking powder in a bowl. Add 125 g butter in pieces, quark, milk, eggs, 125 g sugar, vanillin sugar and salt. Knead first with the dough hooks of the hand mixer, then with your hands to a smooth dough
Roll out to a rectangle (approx. 40 x 44 cm) on a floured work surface. Spread with melted butter and sprinkle with cinnamon sugar. Spread plums on top. Carefully roll up and cut into 7 slices of approx. 5.5 cm width with a sharp knife (the dough will still shrink a little, so instead of 38.5 cm width it is 40 cm). Put snails in a greased springform pan (26 cm Ø) with a high rim. Bake in a preheated oven (electric cooker: 175 °C/ convection oven: 150 °C/ gas: level 2) for 45-50 minutes
Let it cool down a little on a cake rack. Remove the edge of the mould and let the cake cool down. Heat the jam, spread the cake with the jam. Leave to dry.
waiting time approx. 2 hours