In a bowl, combine the tuna, celery, green onion, mayonnaise, lemon juice, and Dijon mustard; season with salt and pepper to taste.
1 cup flaked, 1 celery stalk, 1 green onion, ¼ cup homemade mayonnaise, 1 tbsp. fresh lemon juice, 1 tbsp. Dijon mustard, Sea salt and freshly ground black pepper