Dab the fillets dry and season with salt and pepper. Heat the oil. Fry the fillets until golden brown all around, remove
Pre-cook the beans and savory in boiling salted water for about 10 minutes. Drain and let drain
Cut the bacon into strips and leave out. Onions peel, in columns cut and briefly with brown. Wash and chop parsley. Swivel with the beans in the bacon fat. Season with salt and pepper
Sweat flour in hot fat. Add stock and milk while stirring, bring to the boil. Simmer for about 3 minutes. Melt cheese in the sauce. Mix egg yolk and some sauce, then stir into the rest of the sauce (do not boil any more!). Season to taste
Pour the beans into a greased casserole dish. Cut the fillets into slices and arrange on top. Pour sauce over them. Bake in a hot oven (electric cooker: 225 °C / convection oven: 200 °C / gas: level 4) for 15-20 minutes. Served with: roast potatoes