Sweet Onion & Tomato Stacks

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   Arrange onion slices in a single layer in a 13 x 9 baking dish. Stir together vinegar and next 4 ingredients. Pour over onion slices. Cover and chill 8 hours, turning once. Remove onions from dressing with a slotted spatula, reserving dressing. Grill onion slices, covered with grill lid, over medium-high heat (350-400)2 minutes on each side or until crisp-tender and golden. Layer half of grilled onion slices each with 1 cheese round, 2 basil leaves, and 1 tomato slice; top with remaining half of onion slices. Grill onion stacks, covered grill lid, over medium-high heat 3 minutes or until cheese melts. Serve onion stacks with reserved dressing. Garnish with basil sprigs.

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