Combine Ingredients:In a large bowl, mix the drained tuna, white beans, red onion (if using), and cherry tomatoes.
Dress the Salad:Drizzle with olive oil and lemon juice. Toss gently to combine.
Season and Serve:Add salt and pepper to taste. Garnish with fresh parsley or basil if desired. Let the mixture refrigerate for at least an hour before serving. Then pair with whole-grain crackers, a slice of crusty bread, over mixed greens, or my personal favorite-- scooped up with tortilla chips!