How to Make It
In a medium nonreactive saucepan, bring the vinegar to a simmer over moderate heat. Add the onions and garlic, cover and simmer until the onions begin to soften, about 5 minutes. Transfer the mixture to a bowl to cool.
In a large bowl, toss the tomatoes with the onion mixture, basil, olive oil and Home Spice Mix. Season with salt and pepper. Serve at room temperature.