Combine Tuna and Condiments: In a medium bowl, mix the drained tuna, mayonnaise, Dijon mustard, and sweet pickle relish until well combined.
Add Crunchy Elements: Stir in the chopped celery, red onion, dried cranberries, and apple.
Season: Add salt and freshly ground black pepper to taste.
Serve: Arrange fresh spinach leaves on a plate or in a bowl. Spoon the tuna mixture on top. For a hearty meal, serve the salad in whole grain bread or wraps.
Serving and Storage Tips:
