Preheat oven to 400°F.

In a bowl, mix together tuna, mayo, celery, hot sauce, boiled eggs, dijon mustard, red onion, onion salt, and season with salt & pepper to taste.

Split English Muffins with hands or fork. Smear the outside and inside of each half with butter add a slice of cheddar cheese to the inside of each Muffin. Add a tomato slice to the Muffin bottoms and place on baking sheet to toast for 9 minutes.

Remove baking sheet from oven and then top each half with a scoop of tuna salad, reserving any leftover tuna for later snacking. Cook for an additional 3 minutes.

Remove from oven and bring top and bottom together for the ultimate melt.