This soup is served at the Taste of History restaurant at Greenfield Village in Dearborn, Michigan. I found this recipe on a recipe card on display inside the restaurant. You can substitute spinach for the dandelion greens if they are not available. I usually add more vegetable stock (about 2 to 4 cups) and more corn. Dried herbs can substitute for the fresh--use 4 teaspoons dried basil and 2 teaspoons dried oregano.