Ingredient:

• 2 tablespoons balsamic vinegar
• 1-1/2 teaspoons minced fresh basil or 1/2 teaspoon dried basil
• 1/2 teaspoon salt
• 1/2 cup coarsely chopped sweet onion
• 1 pound grape or cherry tomatoes, halved
• 2 tablespoons olive oil
• 1/4 cup crumbled feta cheese