Creating this spectacular dish is straightforward; just follow these easy steps:

1. Prepare Avocados: Slice the avocados in half and remove the pits. Scoop out a little more flesh to create space for the filling.

2. Make Tuna Salad: In a medium-sized bowl, combine the drained tuna, mayonnaise, Dijon mustard, and lemon juice. Stir until well combined.

3. Add Vegetables: Fold in the finely chopped celery and red onion. Season with salt and pepper to taste. Mix thoroughly.

4. Fill Avocados: Spoon the tuna mixture generously into each avocado half.

5. Garnish: If desired, sprinkle with chopped fresh herbs for added flavor and freshness.

6. Serve Immediately: Enjoy your tuna stuffed avocados fresh for the best flavor and texture.

These steps will guide you in crafting this delightful dish effortlessly!