Knead the flour, butter, egg and salt into a smooth short pastry. Chill for about 30 minutes. Meanwhile clean and wash the cabbage, cut out the stalk and cut the cabbage into wide strips.
Heat fat in a pot, braise cabbage in it and deglaze with broth. Season with salt, pepper and caraway seeds and braise covered for 10-15 minutes. Clean, wash and cut the peppers into strips.
Add to the cabbage 3-5 minutes before the end of the cooking time and cook. Let the cabbage cool down a little and drain. Cut the sausage into slices. Wash parsley and chives, dab dry and chop or cut the chives into fine rolls, except for a little garnish.
Mix eggs, sour cream, mustard, a little salt and chopped herbs (keep a teaspoon of chives). Roll out the short pastry and line a greased quiche tin (26 cm Ø) with it.
Spread the vegetables and sausage on top and pour over the egg-cream mixture. Bake in the preheated oven (electric cooker: 200 °C/ gas: level 3) for approx. 50 minutes. Sprinkle warm with remaining chives and serve garnished with herbs.