Step 1

Combine the tuna, yogurt, Dijon mustard, chopped walnuts, raisins, capers, parsley, salt, pepper and red pepper flakes (if using) in a mixing bowl.

Step 2

Mix with a fork until evenly combined.

Step 3

Place the handful of spinach leaves in the center of the flour tortilla, then dump the tuna fish salad right on top of the spinach.

Step 4

Fold the tortilla over the salad and then push gently but firmly with your hand to form a roll.

Step 5

Tuck the ends in and then finish rolling the tortilla into a tight wrap.

Step 6

Slice on a diagonal and serve immediately, or wrap tightly in plastic film and consume within a day.