Beef and Cheese Arayes

Name: Beef and Cheese Arayes
Ingredients: 1 pound ground beef (80% lean); 1 cup finely minced fresh parsley (about 1 bunch); 1/4 cup pine nuts; 1 teaspoon kosher salt, plus more for sprinkling; 3/4 teaspoon baharat or garam masala; 2 cloves garlic, finely minced; Zest of 1 lemon plus 2 tablespoons lemon juice (from about half a lemon); 1 small tomato, diced finely; 1/2 large white onion, finely minced (about 1 cup); 4 fluffy pitas; Olive oil, for drizzling; Sumac, for sprinkling; One 16-ounce block whole-milk low-moisture mozzarella, grated coarsely