For the dough, mix flour, 2 tablespoons of sugar, vanillin sugar and baking powder. Cut 125 g butter into small cubes. Add butter and 60 ml water and work into a smooth dough first with the kneading hooks of the hand mixer, then with cold hands. Wrap in cling film and chill for about 1 hour. Roll out the dough between two sheets of baking paper to a circle (30 cm Ø).
Place the dough in a greased and flour-spread tart tin with lift-off base (26 cm Ø). Prick the base evenly with a fork. Line with baking paper, spread peas on top. Bake in the preheated oven (electric cooker: 175 °C/ convection oven: 150 °C/ gas: level 2) for about 30 minutes. Remove baking paper and peas. For the cream, boil 250 g butter, 400 g cream, syrup and coffee powder. Simmer at medium heat for about 25 minutes while stirring constantly until creamy. Roast the nuts in a pan without fat while turning for about 4 minutes. Toffees and nuts, up to 20 nuts for decoration, chop and fold into the cream. Fill the cream into the tart.
Simmer at medium heat for about 25 minutes while stirring constantly until creamy. Roast the nuts in a pan without fat while turning for about 4 minutes. Toffees and nuts, up to 20 nuts for decoration, chop and fold into the cream. Fill the cream into the tart. Let it cool down. Chill the tart for about 1 hour. Decorate with remaining nuts and cut into 20 pieces
2 1/2 hours waiting time