Combine tuna salad ingredients into a bowl until combined. Season to taste. You might want to adjust depending on how creamy or spicy you want it to be.
Preheat oven to broil. Scoop tuna salad onto bread and add ¼ cup shredded cheddar. bBoil until cheese gets browned and bubbly.
Add slices of jalapeño, a slice of tomato and a handful of arugula. Season with salt and pepper. Enjoy!