In a small saucepan combine orange juice, sugar, honey, 1/4 cup cold water, lemon juice, and lime juice. Bring to boiling over medium-high heat, stirring constantly. Remove from heat; and let stand 15 minutes.
Place citrus mixture in a blender. Add 1/2 cup tarragon leaves; cover and blend 30 seconds. Line a fine mesh strainer with a double-thickness of cheesecloth. Strain citrus mixture through the sieve; discard any solids.
In a large saucepan bring the 8 cups water to boiling. Remove from heat. Add tea bags; steep for 5 minutes. Remove and discard tea bags. Stir strained citrus mixture into tea. Garnish each serving with orange slices and a tarragon sprig. Makes 8 servings.