Caramelized Leek and Mushroom Gruyere Pasta (Creamy and Cozy) - My Home Made Recipe

Ingredients

• 2 tablespoons olive oil.
• 3 tablespoons butter, divided.
• 3 medium leeks (tops removed, cut in half, and thinly sliced).
• ½ teaspoon salt.
• ½ teaspoon granulated sugar.
• ⅓ cup sherry wine.
• 8 ounces oyster mushrooms.
• 4 garlic cloves, minced.
• 2 sage leaves.
• ¾ cup heavy cream.
• 1 tablespoon balsamic vinegar.
• 1 teaspoon lemon zest.
• 1 lb fettuccine.
• 1 cup reserved pasta water.
• ½ cup grated Gruyere cheese.
• 1 teaspoon black pepper.
• ¼ cup toasted pine nuts.