1/2 cup low-sodium soy sauce
1/2 cup brown sugar
1 to 2 tablespoons chili-garlic sauce (found in the Asian aisle of the supermarket)
1 tablespoon grated fresh ginger
1 teaspoon Chinese five-spice powder (optional)
kosher salt and black pepper
2 1/2 pounds pork shoulder, trimmed of excess fat and cut into 2-inch pieces
1 cup long-grain white rice
1 medium head bok choy, thinly sliced (about 8 cups)
2 scallions, sliced