Clean and finely chop the onion and garlic. Heat the oil and sauté the onions and garlic in it.
Add the mince and fry until crumbly. Chop the tomatoes in the can and use them to deglaze the mince. Season to taste with salt, pepper, cayenne pepper and oregano.
Peel, wash and finely slice the potatoes. Layer thinly in a well-greased baking dish and sprinkle with salt. Wash, clean and slice the tomatoes. Place on the potatoes and cover with the minced meat sauce. Spread the crème fraîche on top and sprinkle with the grated cheese.
Bake in the oven preheated to 200 ° C for 50-60 minutes.