Quick-Marinated Cherry Tomato Salad

Ingredients

• 1 pint red grape tomatoes
• 1 pint yellow grape tomatoes
• 1/2 red onion, thinly sliced
• 1/4 cup olive oil
• 3 tablespoons balsamic vinegar
• 3 tablespoons minced fresh parsley
• 1 heaping tablespoon jarred pesto
• 1/4 teaspoon sugar
• 1 clove garlic, pressed
• Salt
• fresh ground black pepper
• 1 head iceberg lettuce, cut into chunks