Wild Mushroom Cream Sauce

Name: Wild Mushroom Cream Sauce
Yield: Serves Four
Cuisine: United Kingdom
Ingredients: 25 g (1 oz) dried porcini or mixed wild mushrooms; salt and pepper; 150 ml (5 fl oz) double cream; 400-500 g (14-18 oz) dried pasta; 1 onion, finely chopped; a squeeze of lemon; olive oil, for drizzling; 1 glass of white wine; a knob of butter