Clean the mushrooms, rub and possibly halve them. Wash and halve the tomatoes. Peel onion and garlic, dice finely. Wash and pluck the basil
Heat the fat in a coated pan. Fry the mushrooms in it in portions on each side for about 2 minutes. Season and remove
Heat the oil in the frying fat. Place the tomatoes in the pan with the cut surface facing downwards and fry briefly. Add the onion and garlic and braise covered over a mild heat for about 5 minutes. Turn in between. Season and arrange on a plate. Spread basil and mushrooms on top
Mix the stewed stock with vinegar and possibly 2 tablespoons of water, season to taste and pour over the mushrooms. Marinate for at least 30 minutes. Goes well with baguette