Wash the cabbage thoroughly and cut it into bite-sized pieces.
Cut the smoked duck into manageable pieces.
Spread the cabbage evenly in a pan, then place the smoked duck on top.
Cover with a lid and steam over medium-low heat for 7 to 10 minutes.
When the cabbage softens and the duck's fat is rendered, add garlic and green onions on top.
Season with soy sauce and black pepper, then steam for another 2 to 3 minutes.
Transfer the finished steamed dish to a plate and sprinkle sesame seeds for garnish.