Instructions: Place butter into heavy based pan, add the clean button mushrooms and cook gently. Add the garlic and cook out. Then add the tomato puree, white wine, fresh thyme and lemon juice. Reduce until all the liquids have virtually evaporated.

Prepare a puff pastry square and fold over corners, brush down with egg wash and leave to rest for 20 minutes. Place into a pre-heated oven 220F and cook for around 12 minutes until risen and golden brown. Remove from the oven.

Add the double cream to the mushrooms and reduce further. Spoon the mixture into the pastry, scatter with grated Gruyere cheese and a sprinkling of Parmesan. Glaze under a hot grill.

If you would like to email yourself the recipe for later use, or share the recipe with your friends or family, enter the email addresses below and this recipe will be emailed to you and others as well.