Smoky Mushroom Tart

• 1 egg (white)
• 3/8 butter pastry dough
• 3/8 walnut (pieces)
• 110 gr smoked mozzarella cheese
• 100 gr mushrooms (fresh)
• 70 gr shitake mushrooms
• 28 gr butter
• 10 gr grates asiago
• 8 gr garlic (minced fresh)
• 8 gr flat-leaf (chopped)