Marinated Cucumbers, Onions, and Tomatoes Salad

Want a simply, refreshing, and pretty darn healthy salad that is a little bit different than the norm?  Give this a try.

Marinated Cucumbers, Onions, and Tomatoes

3 medium cucumbers, peeled and sliced 1/4 inch thick
1 large onion, sliced and separated into rings
3 medium tomatoes, cut into wedges
1/2 cup vinegar
1/4 cup sugar
1 cup water
2 teaspoons salt
1 teaspoon fresh coarse ground black pepper
1/4 cup oil