Sweet and Sour Tomato Salad

When I found this recipe I was looking for a marinated cucumber salad and stumbled across this very delicious variation.
This makes a lot of dressing, try using half the dressing for one salad and save the rest of the dressing for later use, it will keep for a long time in the refrigerator.

7 tomatoes
1 small yellow onion
1 small cucumber, peeled and sliced
½ c. white sugar
¼ balsamic vinegar
¼ distilled white vinegar
½ c. vegetable oil
Salt and pepper to taste

1. Thinly sliced the tomatoes. Cut the onion in half through root end, then thinly slice into half-circles.
2. In a large bowl, toss together tomatoes, onion, sugar, vinegars, oil, salt and pepper. You may adjust the amounts of vinegar and sugar according to your taste.
3. Serve at room temperature.