Clean the leek, wash it and cut it into rings. Clean, clean and halve the mushrooms. Wash and halve tomatoes. Heat lard. Fry the mushrooms in it until golden brown. Add leek and fry briefly.
Season with salt and pepper. Deglaze with stock, simmer for 5 minutes. Add cream and cheese. Wash herbs, chop finely, add. Add sauce thickener, bring to the boil. Heat tomatoes in it. Season to taste with salt and pepper.
Serve garnished with herb bouquets. A pretzel tastes good with it.