Creamy Tagliatelle With Savory Mushrooms & Hazelnut Crunch

Ingredients

• 1 stick unsalted butter
• 1/3 cup pasta water, reserved from cooking
• 1/2 teaspoon freshly ground pepper
• 1/3 cup grated Parmesan cheese
• 1/2 cup hazelnuts
• 1 pound tagliatelle pasta
• 12 sage leaves
• 1 teaspoon of salt
• Juice of 1 lemon
• 1 large clove garlic, minced
• 1/2 pound mixed mushrooms, such as shiitake, oyster and crimini