Wash the fish, cut it into large pieces and put it on skewers as you like. Season with lemon juice and salt. Just before serving, fry in hot oil for about 5 minutes. In the meantime peel potatoes and wash vegetables. Form balls from potatoes and zucchini with a ball cutter. Cook potatoes in boiling salted water for about 10 minutes, zucchini for about 3 minutes.
For the sauce melt fat. Sweat flour in it. Add cream and stock while stirring constantly, bring to the boil. Season with salt, pink berries and mustard. Warm up potatoes, zucchini and tomatoes in it. Arrange fish, vegetables and mustard sauce on plates, garnished with lime slices and dill