Apparently tuna melts are in as much as sourdough. I can’t stand to eat tuna often, but a melt actually sounds good.
This is just temptation from the article. One is cheddar, the other is jalapeño jack.
View attachment 2202527
They include recipes. I suppose I should add them.
The following recipe is adapted from The Tinned Fish Cookbook.
Tuna Melt With Ketchup

Serves 2
6-oz. can of oil-packed tuna, drained
¼ cup diced red onion
1 scallion, white and light green parts, finely chopped
3 tbsp. coarsely chopped flat-leaf parsley
3 tbsp. mayonnaise
Hot sauce, such as Tabasco
Salt and freshly ground pepper
4 slices of rustic bread
2 tbsp. unsalted butter
4 slices of sharp Cheddar cheese
Ketchup (recipe follows), or your favorite store-bought bottle
In a medium bowl mix the tuna, red onion, scallion, parsley, mayonnaise, and a few dashes of hot sauce. Season with salt and pepper.
Butter each slice of bread on one side. Divide the tuna mixture on the unbuttered side of 2 bread slices and top with the Cheddar and then the other 2 bread slices, buttered sides up. Warm a griddle or cast-iron skillet over moderate heat and fry the sandwiches, carefully turning once, until the bread is crusty and the cheese is melted, about 3 minutes per side. Serve hot with ketchup.
Ketchup
Makes about 2 cups
2 tbsp. olive oil
1 garlic clove, minced
½ cup chopped red onion
One 14-oz. can peeled whole tomatoes
1 ½ tbsp. tomato puree
1 tbsp. dark brown sugar, plus more to taste
1 tbsp. red wine vinegar
Salt and freshly ground pepper
In a medium saucepan, heat the olive oil. Add the garlic and red onion and cook over moderately high heat, stirring, until softened but not browned, about 5 minutes. Add the tomatoes, tomato puree, sugar, and vinegar and cook over low heat, breaking up the tomatoes, until thick, about 8 minutes. Let cool, then transfer to a small blender and puree. Season the ketchup with salt and pepper, and more brown sugar, if desired.