Knead the flour, 125 g butter, 1 pinch of salt, 1 tablespoon cold water and 1 egg first with the dough hook of the hand mixer, then with your hands to a smooth dough. Wrap the dough in foil and let it rest for about 20 minutes.
Remove the outer leaves from the savoy cabbage, cut out the hard stalk and coarse leaf panicles. Cut leaves into pieces. Heat 25 g butter in a frying pan, fry the savoy cabbage for 4-5 minutes, season with salt and pepper and remove.
Peel the horseradish, grate finely, mix with 2 eggs and milk. Season with salt, pepper and sugar. Grease 8 tartlet cups with lift-off base (approx. 12 cm Ø) and dust with flour. Form the dough into a roll and cut into 8 equal pieces.
Roll out the dough pieces one after the other on a floured work surface in a round, thin sheet, line a mould with the dough, press down the edge and cut off any excess dough. Sprinkle each dough base with approx. 1/2 tsp. breadcrumbs, fill in savoy cabbage, press down slightly if necessary and pour over with icing.
Grate the cheese and sprinkle over it. Bake in the preheated oven (electric cooker: 200 °C/ convection oven: 175 °C/ gas: level 3) for 20-25 minutes. Remove quiches from the oven and let them cool down. Arrange the quiches with smoked salmon.