Drain The Tuna: Start by draining the chunk light tuna thoroughly. This step is crucial to avoid a watery salad.

Chop The Veggies: Finely chop the celery and red onion. This ensures an even distribution of crunch and flavor in every bite.

Mix The Ingredients: In a large bowl, combine the drained tuna, chopped vegetables, a generous dollop of mayonnaise, a hint of Dijon mustard, and a squeeze of lemon juice, and season with salt and pepper to taste.

Chill The Salad: Let the salad chill in the refrigerator for at least an hour. This enables the flavors to harmoniously blend together.