Beet-Raspberry Soup

Cover beets with cold water in a large saucepan; bring to a boil. Reduce heat to low and simmer, covered, until tender, 30 to 40 minutes. Remove from heat and let cool. Drain the beets, reserving 1 1/4 cups cooking liquid. Peel the beets. Cut one beet into matchsticks and set aside; cut the remaining beets into chunks. Place the beet chunks, shallots and raspberries in a blender or food processor and puree, adding the reserved cooking liquid as needed for a smooth consistency. To strain the seeds from the mixture, pour through a fine-meshed sieve set over a large bowl. Stir milk, vinegar, lemon juice and sugar into the bowl. Season with salt and pepper. Cover and refrigerate until chilled, at least 1 hour. Garnish each portion with the julienned beets.