Preheat the wok, put butter in. Follow with onion, stir fry until clear. Then add garlic, stir fry until fragrant. Add button mushroom and oregano, stir fry 2-3 minutes. Add truffle seasoning, black pepper, milk and mustard. Slow cook with low heat. When it sticky add the boiled Tagliatelle, yolk and mozzarella cheese, stir fry to mix well. Now ready to serve with grilled lamb ribs and bake vegetables.