Step 1

Heat the olive oil in a frying pan and saute the chopped onions over low heat for 5-7 minutes, then add the garlic and cook briefly for 30 seconds while stirring. Add the mushrooms with a pinch of salt, pepper and chopped rosemary and brown over medium heat until golden.

Step 2

Sprinkle the mushrooms with flour and stir to coat. Deglaze the pan with the Marsala wine and let it bubble away for about 5 minutes until it's reduced by a half. Then add the stock and cook for 5 minutes longer. At the end stir in the double/heavy cream and let it warm through. Taste for seasoning and add more salt if needed, then take off the heat. Sprinkle with fresh parsley before serving if using.