Heirloom Tomato, Mozzarella and Basil Salad
Be aware, though, that tomatoes, especially heirlooms, can vary wildly in both sweetness and acidity, and if your tomatoes are too sweet, they can make the wine taste sour. So look for red and green heirlooms. In general, they'll have the highest acidity—not so much that they'll be sour, but enough to balance the sweetness—while yellow tomatoes will have the least.
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Cut 12 of the basil leaves into thin slices or tear them into small pieces. Set the remaining 4 leaves aside.
Arrange the tomato slices on a platter or on individual plates, stacking them or fanning them out. Add a sprinkle of salt and pepper, a few pieces of the sliced or torn basil, and a slice of cheese between every one or two tomato slices.
Drizzle the vinegar and olive oil over the tomatoes. Sprinkle with the onion, garnish with the reserved whole basil leaves, and serve.
Food and wine tip: This would pair well with Sauvignon Blanc.