Place the tomatoes in a large mixing bowl. Add the garlic, parsley, and basil. Sprinkle with sugar, salt, pepper, and thyme. Add the oil and vinegar.
Toss well and then allow the tomatoes to marinate at room temperature or in the refrigerator for a few hours. The tomatoes will create their own amazing marinade as they rest.
Notes
I've used all kinds of tomatoes for this recipe. It will work nicely with whatever tomatoes you happen to have on hand.