Wash and clean the gooseberries. Weigh 600 g and mix with jam sugar in a large pot. Leave to stand for about 30 minutes.
Meanwhile, for the short pastry, place flour, sugar, vanillin sugar, salt, 50 g almonds, egg yolk, butter in flakes and 1-2 tbsp. water in a mixing bowl and knead first with the dough hooks of the hand mixer, then with your hands to a smooth dough
Roll out to a circle (approx. 30 cm Ø) between 2 layers of baking paper. Remove the upper layer of baking paper. Pour the dough into a greased tart tin (26 cm Ø) sprinkled with flour and press it down. Prick the base several times with a fork. Chill for about 30 minutes.
Boil up gooseberries and jam sugar while stirring. Cook for 4-6 minutes while stirring until bubbly. Make a gelling test. Remove from the heat, stir in the rest of the gooseberries. Cool down for about 30 minutes, stirring several times
In the meantime, place a large sheet of baking paper on the dough. Pour in the dry heirloom and bake in the preheated oven (electric cooker: 200 °C/ convection oven: 175 °C/ gas: level 3) on the lower rack for approx. 20 minutes
Remove from the oven, carefully remove the dried peas and baking paper. Sprinkle the base with 25 g almonds. Spread gooseberry jam evenly on top and bake at the same temperature for another 15-20 minutes on the bottom shelf
Remove from the oven, place on a cake rack and allow to cool in the mould. Whip the cream until semi-stiff, while letting bourbon vanilla sugar trickle in. Cut the tart into pieces (it sticks a bit) and arrange on plates with a blob of vanilla cream
waiting time approx. 3 hours