Finely chop 75 g walnuts. Put flour, 75 g sugar, salt, vanillin sugar, fat, 1 egg yolk and chopped walnuts into a mixing bowl and knead with the dough hooks of the hand mixer. Then work into a smooth dough with your hands. Cover the dough and let it rest in the fridge for about 30 minutes. Grease a tart mould (approx. 28 cm Ø). Roll out the dough on a lightly floured work surface (approx. 32 cm Ø) and line the mould with it.
Refrigerate for another 30 minutes. Prick the dough several times with a fork. Line with baking paper and peas for blind baking. Pre-bake in the preheated oven (electric: 175 °C/ gas: level 2) for about 15 minutes. For the filling, squeeze juice from 1/2 grapefruit (approx. 60 ml). Beat the eggs, remaining egg yolk and remaining sugar with the whisk of the hand mixer until foamy. Stir in grapefruit juice. Whip cream until stiff and fold into the egg mixture. Remove the baking paper and peas from the dough and pour the cream onto the dough. Bake in the preheated oven (electric: 150 °C/ gas: level 1) for 45-55 minutes. Carefully cover the tart 20 minutes before the end of the baking time.
Stir in grapefruit juice. Whip cream until stiff and fold into the egg mixture. Remove the baking paper and peas from the dough and pour the cream onto the dough. Bake in the preheated oven (electric: 150 °C/ gas: level 1) for 45-55 minutes. Carefully cover the tart 20 minutes before the end of the baking time. Let the tarte cool down on a cake rack. Peel the remaining grapefruit so that the white skin is completely removed. Cut the grapefruits into slices and glaze with red cake glaze to taste. Spread on the tart together with the remaining walnuts. Dust with icing sugar and serve. Makes approx. 12 pieces
Let the tarte cool down on a cake rack. Peel the remaining grapefruit so that the white skin is completely removed. Cut the grapefruits into slices and glaze with red cake glaze to taste. Spread on the tart together with the remaining walnuts. Dust with icing sugar and serve. Makes approx. 12 pieces
waiting time approx. 2 hours