Tomato, Cucumber and Red Onion Salad with Mint Recipe

2 large cucumbers - halved lengthwise

seeded and sliced

⅓ cup red wine vinegar

1 tablespoon white sugar

1 teaspoon salt

3 large tomatoes

seeded and coarsely chopped

⅔ cup coarsely chopped red onion

½ cup chopped fresh mint leaves

3 tablespoons olive oil

salt and pepper to taste