This Christmas Eve, you are invited to the first course of a traditional Polish supper with this clear borscht soup. The soup is made from beetroots and mushrooms. Traditionally, it is poured over homemade mushroom dumplings, but you can choose your favorite tortellini instead. If you prefer a complete dinner meal, keep the vegetables in the soup. To make the flavor experience complete, serve the soup with fresh herbs, a dollop of sour cream, and a slice of dark rye bread.