6 (1/4 inch thick) slices tomato
6 red onion slices
2 tablespoons olive or vegetable oil
4 teaspoons red wine vinegar
2 tablespoons chopped fresh basil
1 teaspoon sugar
Place tomatoes in a shallow dish; top each slice with an onion. In a small jar with tight-fitting lid, combine remaining ingredients; shake well. Pour over tomatoes and onions. Cover and refrigerate for at least 1 hour.