1: 1. Start with high-quality canned tuna for maximum flavor. 2. Mix in Greek yogurt for a protein boost without heavy mayo.

2: 3. Don't forget to add crunchy celery and red onion for texture. 4. Sprinkle in some fresh herbs like dill or parsley for added freshness.

3: 5. Opt for whole grain bread for a fiber-rich base. 6. Top with avocado slices for creamy richness and extra nutrients.

4: 7. Consider adding a kick of spice with a dash of hot sauce or sriracha. 8. Toast your bread for extra crunch and flavor.

5: 9. Experiment with different seasonings like lemon pepper or Old Bay. 10. Pack your tuna salad sandwich with plenty of leafy greens for added vitamins.

6: 11. Swap out traditional mayo for mashed avocado for a healthier twist. 12. Add a squeeze of lemon for a bright, citrusy pop of flavor.

7: 13. Upgrade your tuna salad with diced apples or grapes for a sweet surprise. 14. For a low-carb option, serve your tuna salad on lettuce wraps.

8: 15. Boost the protein content by mixing in cooked quinoa or chickpeas. 16. For a Mediterranean twist, add olives, feta cheese, and sun-dried tomatoes.

9: 17. Customize your tuna salad with your favorite mix-ins like pickles or nuts. 18. Experiment with different types of bread, from whole wheat to sourdough.