Mix butter and 75 g sugar with the dough hooks of the hand mixer. Add egg, cream and 150 flour and knead. Remove approx. 1/3 of the dough, press flat, wrap in foil and freeze for approx. 2 hours.
Put the rest of the dough into a greased tart tin (26 cm) with a lift-off base and press it down to form the base. Prick the dough several times with a fork, line with baking paper and fill in dried peas.
Pre-bake the tart on the lower shelf in a preheated oven (electric cooker: 175 °C/ convection oven: 150 °C/ gas: see manufacturer) for approx. 10 minutes. Remove from the oven, remove peas and paper, allow the base to cool on a cake rack.
Peel and quarter the apples and remove the core. Grate apple quarters finely and mix with 1 tbsp. flour and 1 tbsp. sugar. Spread the apple mixture on the base. Grate the frozen dough with a coarse grater.
Bake in the preheated oven (electric cooker: 175 °C/ convection oven: 150 °C/ gas: see manufacturer) for approx. 30 minutes. Remove and let cool on a cake rack. Carefully remove from the tin, place on a cake plate and dust with icing sugar.