Place the rice in a pot or rice cooker with 3 cups water. Cook according to package instructions, and set aside for serving.
Meanwhile, heat the olive oil in a large nonstick skillet over high heat. Add the pork pieces and cook for about 10 minutes, turning occasionally, until crispy on all sides. Remove to a paper towel lined plate and set aside.
Add the Chinese broccoli (or broccolini and bok choy), garlic, and red pepper flakes to the pan. Saute one minute until fragrant. Add the soy sauce, oyster sauce, sugar, chicken broth, and black pepper. Cook uncovered, stirring often, over high heat for about 6 minutes, or until the broccolini is crisp tender.
Add the pork and saute one more minute until heated through and everything is covered in sauce. Serve over warm brown rice.