Wash the schnitzel and dab dry. Season flour with salt and pepper. Turn the schnitzel in it, dab off excess flour. Clean, wash and cut leek into rings. Peel and chop onion.
Wash and clean the tomatoes and cut them into small cubes. Wash sage, pluck leaves, chop if necessary. Heat oil. Brown onion and leek in it. Add the tomatoes and cook for 5 minutes. Stir in cream, crème fraîche and gorgonzola, bring to the boil briefly. Season with salt, pepper and sage. Pour the schnitzel and sauce into an ovenproof dish. Cook in the preheated oven (electric cooker: 150 °C/ convection oven: 125 °C/ gas: level 1) for about 1 1/2 hours.
Stir in cream, crème fraîche and gorgonzola, bring to the boil briefly. Season with salt, pepper and sage. Pour the schnitzel and sauce into an ovenproof dish. Cook in the preheated oven (electric cooker: 150 °C/ convection oven: 125 °C/ gas: level 1) for about 1 1/2 hours. Garnish with fresh sage. Serve with fresh baguette