Whisk together lemon juice, oil, garlic and salt and pepper in a small bowl. (optionally you might like to add a small amount of dijon mustard if you'd like a little kick)
Gently combine tuna, onion, beans, cucumber, tomatoes, avocado and parsley in a bowl
Pour the dressing over the tuna salad to serve, and enjoy!
Keyword High Protein, No-Cook Recipe, Spring, Summer