Prepare rice according to package directions.
Combine the oils over high heat in a large frying pan with raised sides, such as a wok. When the oil is hot add the garlic, onion, and turnip roots and cook, stirring constantly, until the onion is translucent.
Stir in the bok choy, garlic scapes and soy sauce. When the bok choy begins to wilt, add the turnips greens and, using the bok choy stems as an indicator, cook until just tender.
Serve hot over rice. Sprinkle with toasted sesame seeds, if desired.
Serves 4.