1. Melt butter in medium saucepan over medium-low heat. 2. Add mushrooms and onion and cook until onion is translucent, stirring occasionally,about 10 minutes. 3. Stir in tomato paste; add stock and vermouth and simmer 10 minutes to blend flavors. 4. Degrease soup, if necessary. 5. Season with salt and pepper. 6. Serve immediately, passing Parmesan separately. ---------------------------------------------------------------------------
Nutrition
Ingredients