Peel, wash and cut the potatoes into pieces and cook them in boiling salted water for about 20 minutes. Peel and finely dice the onion. Clean, wash and cut the salad into strips. Wash thyme, dab dry and remove leaves from the stems. Wash fish, dab dry and cut into pieces. Season with salt and pepper and turn in flour
Heat butter in a pan and fry bacon in it while turning. Add onion and thyme and fry briefly. Add lettuce strips, mix in and remove from heat. Heat oil in a large pan. Fry the fish in it, first the skin side and then the meat side until golden brown
Drain the potatoes and let them evaporate briefly. Mash with milk to a puree. Fold in the bacon mixture. Season with salt and nutmeg. Drain fish on kitchen paper. Serve with the mashed potatoes