Knead 400 g flour, 150 g butter in pieces, 1 teaspoon salt, vinegar and 75-100 ml ice-cold water first with the dough hooks of the mixer, then with your hands to a smooth dough. Wrap dough in cling film and chill for about 30 minutes.
Clean, wash and halve the pumpkin. Remove seeds with a tablespoon. Cut the flesh with the skin into thin slices (approx. 1⁄2 cm). Crème fraîche with salt, pepper, approx. 1⁄4 TL chili flakes, 1 pinch each of cumin and coriander.
Preheat oven (electric cooker: 200 °C/circulating air: 175 °C/gas: see manufacturer).
Grease a baking tray (approx. 35 x 40 cm). Roll out the dough on the tray and prick it more often with a fork. Spread the chilli-crème-fraîche on top, leaving a 2-3 cm wide rim.
First spread pumpkin, then feta cheese on top and sprinkle with pumpkin seeds. Season with salt and pepper. Fold 2-3 cm of dough all around the inside as a rim over the topping. Bake in the oven for 30-40 minutes until golden brown.