Fill a 6-cup ring mold with water to come halfway up the side; freeze about 2 hours. Arrange small cherry tomatoes and mint sprigs in small clusters on ice in ring mold; carefully add enough water to fill. Freeze until firm.
Combine tomato juice, vodka, horseradish, lemon juice and TABASCO® Garlic Sauce in a large punch bowl. Just before serving, add seltzer and unmolded ice ring.
Makes 8 servings.