Salt the fish fillet, sour with lemon juice and cut into cubes.
Also dice the ham and fry in a non-stick pan until crispy.
Cut onions into rings and peppers into strips and celery into pieces. Add the vegetables, fry them briefly, deglaze with the stock and cook for about 5 minutes.
Stir in vinegar and tomato paste and season well with salt, pepper and paprika powder. Add fish cubes and heat for about 5 minutes.
Serve the cod and pepper pan with potatoes. Sprinkle chopped parsley over the potatoes.