This is an elegant pasta dish for a special occasion. The sauce is light and broth-like, and the mushrooms add a meaty taste and texture.Ingredients:1 cup dried porcini mushrooms1/2 teaspoon kosher salt2 tablespoons extra-virgin olive oil1/2 cup grated parmesan cheese4 scallions, chopped1 tablespoon butter1 tablespoon fresh thyme leaves, or 1/4 teaspoon driedPepper to taste3 cloves garlic, minced8