1 pound roast pork belly, cut into 1/2- by 1/2- by 1-inch pieces (see note above)
1 teaspoon vegetable oil
1 pound Chinese broccoli (kai lan), trimmed and cut into 1-inch pieces
2 large cloves garlic, peeled and smashed
2 fresh bird's eye chilies, smashed (or cut into thin slices)
2 tablespoons oyster sauce
1/2 teaspoon sugar
Fish sauce to taste (see note above)