Creating your delicious Tuna Salad Wraps is simple if you follow these steps:

1. Prepare the Tuna: In a mixing bowl, add the drained tuna.
2. Mix Ingredients: Add mayonnaise, Dijon mustard, lemon juice, chopped celery, and chopped onion. Stir well until all ingredients are combined.
3. Season: Add salt and pepper to taste, mixing again to ensure even flavor distribution.
4. Prepare Tortillas: Lay the whole wheat or spinach tortillas flat on a clean surface.
5. Add Greens: Place the mixed leafy greens evenly across the center of each tortilla.
6. Spoon on Tuna Salad: Add generous scoops of the tuna salad over the greens.
7. Top with Vegetables: If desired, layer shredded carrots, sliced cucumbers, and sliced tomatoes on top of the tuna salad.
8. Wrap It Up: Fold the sides of the tortilla and then roll it tightly from the bottom to form a wrap.
9. Slice and Serve: Cut each wrap in half and serve immediately, or wrap them in foil for easy transportation.

These simple steps yield an incredibly delicious and satisfying meal perfect for any time of day!