Wash the meat, dab dry and season with salt and pepper. Wrap 1 slice of bacon around each fillet. Heat oil in a large, coated pan. Fry the fillets for 6-8 minutes while turning. In the meantime, clean and wash the spring onions and cut them into larger pieces. Peel garlic and chop finely. Wash tarragon, dab dry and chop finely
Remove the fillets from the pan. Heat 1 tablespoon of butter in a saucepan. Add spring onions and fry for approx. 3 minutes, turning over. Season with salt and pepper and take out. Heat 2 tbsp. butter in a pan with frying fat, fry garlic in it. Stir in flour and sauté briefly. Add stock and cream while stirring. Bring to the boil, cook for about 3 minutes. Stir in mustard and tarragon and season to taste with salt, pepper and sugar. Grate cheese
Grease round gratin dish. Layer fillets and spring onions. Pour tarragon-mustard sauce over it. Sprinkle with cheese. Bake in the preheated oven (electric cooker: 200 °C/ convection oven: 175 °C/ gas: level 3) for about 15 minutes. Delicious with baguette bread