Wash the potatoes and cook for about 20 minutes. Quench, peel and let cool
Peel and chop the onions. Clean, wash and quarter the savoy cabbage and remove the stalk. Cut cabbage into strips. Steam both in hot oil for about 6 minutes. Add half the ham. Seasoning
Line a springform pan (26 cm Ø) completely (bottom and edge) with a large piece of baking paper so that the egg milk does not run out. Grease if necessary. Mix milk, eggs and cream, season. Cut potatoes into slices
Put half the potatoes in the form. Spread the savoy cabbage and some egg milk on top. Layer the remaining potatoes like roof tiles. Pour the rest of the egg milk over it and sprinkle the rest of the ham over it
Bake the cake in a preheated oven (electric oven: 200 °C/ convection oven: 175 °C/gas: level 3) for approx. 1 1/4 hours. Sprinkle with cheese after 30 minutes