Place ginger, a little at at time, in a garlic press to extract juice; reserve juice (should have about 1-1/2 teaspoons juice).
In a blender container or food processor bowl combine ginger juice, pineapple juice, orange juice, lime juice, and cilantro. Cover and blend or process until nearly smooth. Garnish with fresh cilantro sprig. Serve immediately, Makes 6 servings.