Start by draining the tuna and flaking it into a large mixing bowl.
Add halved cherry tomatoes, thinly sliced red onion, and drained white beans to the bowl.
Gently toss everything together until well combined.
Arrange a generous handful of arugula on each plate, then top with the tunafish mixture.
Drizzle with your favorite dressing – a simple vinaigrette or lemon garlic dressing works wonders.
Serve immediately and enjoy the fresh, vibrant flavors!