When Pizza Express stops doing my favourite, I make my own version...
Wash and rinse the mushrooms getting rid of dirt. I prefer to keep skin on but this is optional. Cut the mushrooms and red onion into thin slices. Chop the Parsley for garnish.
In a saucepan, add your rapeseed oil and the garlic. Once browned slightly, fry your onions until they have softened. Add your mushrooms and cook until there is not liquid in the saucepan. Add the single cream and cook for few minutes until slightly thickened. Add salt and pepper to taste and you are ready to plate up.
Pre heat the oven to the required temperature on the packet. You can make your own bread but I prefer having this bread. Once cooked, spread your sauce and drizzle a little bit of balsamic vinegar on top. Garnish with Parsley.