Begin by preheating your broiler, ensuring it's ready to give your Tuna Melts the perfect golden finish.
In a medium bowl, combine the drained tuna, minced shallot, mayonnaise, lemon juice, parsley, salt, hot sauce, and freshly ground pepper. Mix well to create a flavorful tuna salad.
Take each slice of toasted whole-wheat bread and spread 1/4 cup of the tuna mixture evenly. Top it with slices of fresh tomatoes, adding a burst of freshness and juiciness.
Sprinkle 2 tablespoons of shredded sharp Cheddar cheese on top of each tuna-covered slice. The cheese will melt beautifully during the broiling process.
Place the assembled Tuna Melts on a baking sheet and put them under the broiler. Keep a close eye as the cheese melts and turns golden brown, usually taking 3 to 5 minutes.
Once the cheese is bubbling and the edges are golden, remove the Tuna Melts from the broiler. Allow them to cool for a minute before slicing and serving.