Drain the canned tuna thoroughly and break it up in a mixing bowl. Add chopped red onion and gherkins, then mix in Greek yogurt and sriracha (if using). Stir well.

Lay a tortilla wrap on a flat surface and sprinkle grated cheddar cheese in the center, leaving space around the edges.

Spoon the tuna mixture over the cheese, then top with fresh spinach.

Fold the sides of the tortilla inward and roll it tightly from the bottom to secure the filling inside.

Preheat a non-stick pan over medium heat. Place the wrap seam-side down and toast each side for 2-3 minutes until golden brown.

Let the wrap cool slightly on a cutting board before slicing in half.