Wash, peel and cut the potatoes into pieces. Cook in salted water for about 20 minutes. Clean, wash and dice the peppers. Peel and halve the onion and cut it into slices.
Wash, clean, peel and dice the carrots. Fry the minced meat in hot oil. Add paprika, onion and carrots and fry for 1-2 minutes. Add tomato paste and herbs, sweat.
Add the canned tomatoes, chop the tomatoes in the pot. Let simmer at mild heat for about 10 minutes. Heat milk. Drain the potatoes, let them steam briefly. Pour in milk, mash everything to puree.
Season to taste with salt and nutmeg. Season ragout with salt, pepper and sugar. Pour the ragout into an ovenproof dish (26 cm Ø). Pour on the puree and sprinkle with cheese. Bake in a preheated oven (200 °C/ convection oven: 175 °C/ gas: level 3) for about 20 minutes.
Serve garnished with marjoram.