Combine garlic, lemon juice, balsamic vinegar, olive oil, honey, salt, pepper, and herbs in a blender or screw-top jar and shake or process until well blended. Set aside.
Drain the tuna, beans, and corn (rinsing the beans and corn is optional).
Combine the tuna, onion, white beans, cherry tomatoes, avocado, garlic, sweet corn, basil, and parsley in a large mixing bowl.
Pour the desired amount of dressing over the salad and mix well. Serve over a bed of baby greens, and enjoy.