Clean and wash the Brussels sprouts and cut the stalk crosswise. Cover and cook in boiling salted water for about 15 minutes. Cook the spaetzle in boiling salted water for about 12 minutes (see package instructions).
In the meantime peel the onion and cut it into rings. Fry in hot oil until golden brown. Take out. Drain cabbage and spaetzle.
Wash the meat, dab dry and dice coarsely. Fry in hot frying fat until golden brown. Season with salt and pepper. Stir in milk, 5 tablespoons of water and stock. Bring everything to the boil. Bind with sauce thickener.
Mix in spaetzle and Brussels sprouts. Season to taste with salt and pepper.
Wash and roughly chop the parsley. Sprinkle over the pan with the onion rings. Arrange everything.