Cheesy Tuna and Rice Wrap

Ingredients

• 8 ounces canned tuna, drained and flaked
• 1/2 English cucumber, thinly sliced
• 1/2 teaspoon black pepper
• 4 flour tortillas (10-inch)
• 1 1/2 cups cooked white rice
• 1/2 cup celery, finely chopped
• 1/3 cup yellow onion, minced
• 1/2 cup canned sweet corn, drained
• 1 cup shredded cheddar cheese
• 1/2 cup mayonnaise