Crab Melts

Name: Crab Melts
Prep time: 10 min
Cook time: 10 min
Total time: 20 min
Cuisine: American
Ingredients: 1/2 cup freshly grated mozzarella cheese (divided); 1/3 cup canned crab meat; 3 tablespoons mayonnaise; 1/2 tablespoon chopped fresh dill; 1/4 teaspoon garlic powder; 1/4 teaspoon smoked sweet paprika; 1/8 kosher salt (to taste); 1/8 teaspoon ground black pepper (to taste); lemon zest from 1 lemon; 1 tablespoon chopped fresh parsley (divided); 2 thick slices salad tomato (1/4 inch thick); 2 thick slices of sourdough bread (1/2 inch thick); 1 to 2 tablespoons unsalted butter