Marinated Cucumbers, Onions, and Tomatoes

Ingredients:
3 medium cucumbers, peeled and sliced 1/4 inch thick
1 medium 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
1 teaspoon chopped fresh mint (optional)

Directions:
1. Combine all ingredients in a large bowl.
2. Toss well to mix.
3. Refrigerate at least 2 hours before serving.