Peel, halve and slice the onions. Peel and finely chop the garlic. Drain the mushrooms and cut into slices. Wash the tomatoes and cut into quarters. Wash the peppers, cut lengthways into quarters and core. Cut from the short side into strips that are not too thin. Cut the meat into approx. 3 cm cubes.
Heat the oil in a pan and lightly fry the onions and garlic in it. Do not let the garlic brown or it will turn bitter. Then add the diced meat and fry for 5 minutes, stirring carefully. Season with salt and pepper. Add the pepper strips and stir-fry for 3 minutes. Now add the mushrooms and fry everything for another 3 minutes. Finally stir in the tomatoes and stir-fry for another 3 minutes. Add the sherry, bring to the boil, thicken the sauce with crème fraîche and season with salt, pepper and cayenne pepper (important!).