Grilled Sweet Peppers & Onions

Name: Grilled Sweet Peppers & Onions
Prep time: 15 min
Cook time: 22 min
Total time: 37 min
Yield: 4 serving(s)
Ingredients: 1 large onion, chopped; 1 red pepper, sliced thin; 1 yellow pepper, sliced thin; 2 garlic cloves; salt and pepper; 2 tablespoons olive oil; 1 tablespoon balsamic vinegar