1. In a large pot set over medium heat, heat butter and olive oil. Add onions, carrots, and celery and cook until vegetables begin to soften, about 5 minutes. Add garlic and cook until fragrant, about 1 minute. Pour sherry over veggies, scraping up any brown bits on the bottom of the pan. Stir in tomatoes, sugar, broth and thyme. 2. Turn heat to high and bring to boil, then reduce heat to medium and gently simmer 25 to 30 minutes. (Vegetables should be tender but still have some crunch). Season with salt and pepper and serve. Makes 4 servings, each serving: 234 cal, 14 g fat, 4 g protein, 24 g carb.