Peel and finely chop the onion. Finely dice the bacon. Clean, wash and drain the savoy cabbage. Cut cabbage into strips from the stalk. Heat the fat in a large pan and fry the bacon and onions.
Add savoy cabbage, sauté and season with salt, pepper and nutmeg. Pour in broth, bring to the boil, cover and cook for about 20 minutes. Meanwhile, wash the pike-perch, dab dry and season with salt and pepper.
Press fish fillets with the skin side in flour, knock off excess flour. Cut the skin side slightly. Heat the oil in a large pan. Fry the fish over medium heat, turning (first on the skin side) for 4-5 minutes.
Remove and keep warm. Add soy sauce, honey, vinegar and fish stock to the pan and allow to boil down for approx. 5 minutes. Mix the starch with 2 tbsp. water and thicken the stock. Arrange the savoy cabbage, pike-perch and balsamic vinegar stock on plates.