Preheat oven to broil.
In a large bowl mix tuna, mayonnaise and carrot (or celery). Stir to combine and season to taste with salt and pepper.
Break English muffins in half and cover each half with the tuna mixture.
Add a touch of cheese on top of each muffin. Broil the muffins for 2–3 minutes until the cheese is melted and lightly brown.
8 servings