Clean, wash and shake dry the rocket. Cut approx. 1 bunch of rocket smaller. Chop the hazelnuts, roast them brown in a pan without fat, take them out. Grate 15 g cheese. Put olive oil, chopped rocket, hazelnuts and grated cheese into a high container and puree with a blender.
Mix pesto with sour cream, season with salt, pepper and a little sugar. Wash, clean and slice the tomatoes. Clean, wash and slice the mushrooms. Roll out the dough and place on a baking tray on baking paper.
Spread the pesto-cream mixture over it and smooth it down. Cover with tomato slices and mushrooms. Bake in the preheated oven (electric cooker: 225 °C/ convection oven: 200 °C/ gas: level 4) for 13-15 minutes.
Slice the remaining cheese. Cut the tarte flambée into pieces, cover with rocket and 1 slice of ham each, and sprinkle with Pecorino slicer.