It can be difficult to pick the perfect pastry or confection when up against so many recipes. This truly decadent recipe for Onion and Mushroom Tart is so rich and dreamy, your taste buds should be screaming for a bite right now! The recipe combines the buttery flakiness of the puff pastry with white chocolate and fresh orange juice and creamy mascarpone cheese for a creamy, sweet and rich dessert that will please the palate.