1. Rinse the rapini and pat dry. Cut the heads, tender stems, and leaves from the center stalk. Cut large leaves in two and set aside. Cut the stalks into ½-inch lengths.

2. In a small bowl, combine the water and sesame seed oil and set aside. Heat the vegetable oil in a wok or large skillet. Add the ginger and garlic and stir briefly over high heat. Add the rapini stems, stalks, and heads and toss to coat. Pour in the water and oil mixture. Cover the pan and reduce the heat. Simmer for 3 to 4 minutes or until the stalks are crisp-tender. Add the rapini leaves. Increase the heat and stir continuously until all the liquid is evaporated. Transfer to a serving dish and sprinkle with sesame seed.