Chop nuts for the floor. Knead flour, 125 g sugar, 1 packet vanilla sugar, salt, 1 egg, 125 g butter in flakes and nuts to a dough. Grease a tart mould (28 cm Ø, 3 cm high at the edge; with lift-off base) and sprinkle with flour.
Pour the dough into the mould, press the base and rim. Prick several times with a fork and chill for about 30 minutes. In the meantime, add the vanilla pod lengthwise.
Mix 50 g butter, 1 packet of vanilla sugar, vanilla pulp and 125 g sugar well with the whisk of the hand mixer.
Separate 4 eggs. Add egg yolks to the butter-sugar mixture and mix. Add cream cheese, quark and lemon juice and stir well. Add sauce powder and mix well as well.
Beat egg whites until stiff. Fold into the quark mixture in portions. Sprinkle the base with almonds. Add the quark mixture, smooth it down and bake in a preheated oven (electric cooker: 175 °C/ convection oven: 150 °C/ gas: see
manufacturer) bake on the bottom rack for approx. 50 minutes. Remove from the oven, place on a cake rack and allow to cool.
Clean, wash and cut the rhubarb into pieces of about 1 cm. Bring juice, 1 packet of vanillin sugar, 75 g sugar and rhubarb to the boil in a pot. Simmer for 4-5 minutes. Stir 5 tablespoons of water and starch until smooth.
Pour into the boiling rhubarb while stirring, bring to the boil and simmer for about 1 minute. Pour into a bowl and let it cool down.
Carefully remove the cake from the tin, lift it out and cut it into pieces. Arrange the cake on plates with some rhubarb compote. Add the rest of the compote.