Sauté the onions in butter, heat the pan very strongly and fry the salmon vigorously and deglaze with the white wine. Transfer the salmon to a bowl and cover. Put the cream and the mushrooms in the pan and let reduce a little, if necessary thicken a little. Season with salt and pepper and add the wild garlic. Add the salmon again and let it steep a little more. Tender wheat, rice, pasta or simply baguette tastes good with it.