Knead 250 g flour, 1 pinch of salt, 1 egg, fat in pieces and 2 tablespoons of cold water first with the dough hooks of the hand mixer, then briefly with your hands to form a smooth dough. Cover and chill for about 1 hour
Clean broccoli, wash it, cut it into florets. Cover and steam in little boiling salted water for about 3 minutes. Drain well. Wash, dry and dice the smoked pork loin. Peel and chop the onions. Clean the mushrooms, wash if necessary and cut in half or quarters. Fry in hot oil. Fry onions and smoked pork loin briefly. Season with pepper, let cool down
Roll out the dough on a little flour until round (approx. 34 cm Ø). Line a greased springform pan (26 cm Ø) with the dough and press it on the edge. Whisk 5 eggs and milk. Season with salt, pepper and nutmeg
Spread the Kasseler mushroom mixture and broccoli on the dough. Pour egg milk over it. Bake the cake in the preheated oven (electric cooker: 200 °C/circulating air: 175 °C/gas: level 3) for approx. 45 minutes until golden brown