In a mixing bowl, combine the soy sauce, fish sauce, oyster sauce, brown sugar, minced garlic, ground coriander, and black pepper. Stir well until the sugar is dissolved and the marinade is well mixed.

Add the sliced pork to the marinade and make sure each piece is well coated. You can marinate the pork for at least 2 hours, but for best results, marinate it overnight in the refrigerator.

Preheat your grill to medium-high heat.

Thread the pork slices onto skewers, making sure not to overcrowd them. If using wooden skewers, soak them in water for 30 minutes before threading the pork to prevent them from burning.

Brush the grill grates with vegetable oil to prevent sticking.

Place the skewers on the grill and cook for about 4-6 minutes per side, or until the pork is cooked through and slightly charred on the edges.

Once cooked, remove the skewers from the grill and let them rest for a few minutes.