Marinated Cucumbers, Onions, and Tomatoes

Name: Marinated Cucumbers, Onions, and Tomatoes
Prep time: 15 min
Cook time: 2 h
Total time: 2 h 15 min
Yield: 6-8 serving(s)
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; 2 teaspoons salt; 1 teaspoon fresh coarse ground black pepper; 1/4 cup oil; 1 teaspoon chopped of fresh mint (optional)