1: 1. Choose quality tuna for a flavorful sandwich.

2: 2. Add crunchy celery and red onions for texture.

3: 3. Mix with creamy mayonnaise and tangy Dijon mustard.

4: 4. Season with salt, pepper, and a squeeze of lemon.

5: 5. Serve on toasted whole grain bread for added crunch.

6: 6. Customize with avocado, pickles, or hard-boiled eggs.

7: 7. Try adding fresh herbs like parsley or dill for extra flavor.

8: 8. Don't forget to chill for at least 30 minutes before serving.

9: 9. Enjoy a delicious and satisfying tuna salad sandwich!