For an even richer flavor, roast the tomatoes before adding them to the soup. If you don't have fresh garlic, 1/2 teaspoon of garlic powder can be substituted. Adjust the amount of feta cheese to your liking. For a tangier soup, use more. A swirl of pesto or a sprinkle of red pepper flakes adds a delightful finishing touch. This soup can be made ahead of time and reheated. The flavors will deepen overnight. The best pot for cooking this soup is either a dutch oven or a large saucepan. Consider adding a pinch of smoked paprika for depth.