Macau Pork Chop Sandwich

Name: Macau Pork Chop Sandwich
Ingredients: 1 tablespoon (9g) Diamond Crystal kosher salt; for table salt, use half as much by volume or same weight; 1/2 teaspoon MSG, such as Aji-no-moto; 1/2 teaspoon baking soda; 1/2 teaspoon five spice powder (see notes; 3 tablespoons (45g) dark brown sugar; 3 leaf bay leaves; 1 1/2 teaspoons cumin seeds; 1 1/2 teaspoons coriander seeds; 1/4 teaspoon white peppercorns; Four 1/2-inch-thick bone-in pork chops (about 6 ounces; 170g each), see notes; 4 pineapple buns or Portuguese rolls, halved horizontally (see notes); 2 tablespoons (28g) unsalted butter; Vegetable oil, for frying