For the béchamel sauce, melt the fat in a saucepan. Stir in the flour, sweat briefly. Add milk and cream little by little while stirring. Bring to the boil, simmer for 6-8 minutes, remove from heat. Season to taste with salt, pepper and nutmeg.
Peel garlic and onion and cut into small pieces. Grate cheese. Heat the oil in a large frying pan. Fry the minced meat for 3-4 minutes while turning it over. Add onion and garlic and fry for about 2 minutes.
Add the frozen vegetables, bring to the boil once at the highest setting, then reduce the heat and simmer for about 5 minutes. After about 2 minutes add tomato paste, 150 ml water and 50 g cheese.
Season to taste with salt and chilli.
Place the vegetable pan on the middle of each tortilla and roll it up. Place them side by side in two small ovenproof casseroles (23 cm Ø; 3 cm high). Pour béchamel sauce over them and sprinkle with the rest of the cheese.
Bake in a preheated oven (electric cooker: 200 °C/ convection oven: 175 °C/ gas: see manufacturer) for 10-15 minutes. Wash coriander, shake dry and pluck leaves. Remove enchiladas from the oven, sprinkle with coriander and serve immediately.