For the morel boletus sauce, soak the dried mushrooms in a bowl with a little water (should be well covered) for about 1/2 hour. Saute the finely chopped onion in olive oil until translucent.
Squeeze the soft mushrooms (put the soaking water aside) and chop – fry briefly. Deglaze with white wine. Add whipped cream and processed cheese and simmer gently.
Season with salt and pepper. When the sauce thickens a bit, add a little soaking water and continue to simmer until it becomes nice and creamy.
Serve the morel and porcini mushroom sauce as desired.