Lightly toast the tortilla in a pan.
Prepare the spicy tuna and drain any excess liquid.
Wash the lettuce thoroughly and tear it into bite-sized pieces.
Julienne the bell pepper and onion.
Place lettuce, bell pepper, onion, and spicy tuna in order on the tortilla.
Drizzle with mayonnaise or your preferred sauce.
Roll up the tortilla and cut into bite-sized pieces.