Yield: 12 servings
Heat 1 cup of water to boiling. Pour water over tea bags; let steep 10 minutes. Remove tea bags; cool tea. Heat remaining 4 cups water to boiling. Stir in sugar until dissolved. Remove from heat; cool 20 minutes. Mix tea, sugar, water, lemonade concentrate and vodka in 3-quart plastic container. Cover and freeze at least 24 hours.
To serve, place 2/3 cup slush in each glass and fill with 1/3 cup sparkling water; stir. Garnish with lemon slices.
Please note that some ingredients and brands may not be available in every store.