Peel or clean and wash potatoes, carrots and Brussels sprouts. Cut potatoes into cubes, carrots into thick slices
Boil the potatoes with about 1/2 l salted water. Add Brussels sprouts and cook covered for about 15 minutes. Add carrots and cook for about 10 minutes. Drain, collecting 3/8 l vegetable water. Fill vegetables and potatoes into a greased casserole dish
Fry the flour in 2 tbsp. hot fat until golden brown. Stir in vegetable water and milk. Bring everything to the boil and simmer for about 5 minutes. Grate cheese and melt in the sauce. Season to taste
Wash the meat, dab dry and cut into slices. Season with salt and pepper. Place on the vegetables. Pour sauce over them. Bake in the preheated oven (electric cooker: 200 °C/circulating air: 175 °C/gas: level 3) for approx. 20 minutes until golden brown
The casserole gets an exotic touch, if you season the sauce with 2 teaspoons curry