Sheet Pan English Muffin Tuna Melts

Name: Sheet Pan English Muffin Tuna Melts
Ingredients: 2 5-oz. cans water-packed solid white tuna, drained; ¼ cup mayonnaise; 1 celery stalk, chopped (about ¼ cup); 1 small shallot, chopped (about 2 tablespoons); 2 tablespoons fresh lemon juice; 1 tablespoon extra-virgin olive oil; 1 tablespoon Dijon mustard; ¼ teaspoon kosher salt; Freshly ground black pepper; 1 tablespoon plus 2 teaspoons chopped fresh dill, divided; 3 English muffins, halved and toasted; 6 tomato slices (from 1 large tomato); 6 slices Swiss cheese (6 oz.); Sriracha or hot sauce, for serving (optional)