1. Separate duck egg white and yolk. Combine all ground meat ingredients, including duck egg white (if using). In a separate bowl, whisk egg, water and pepper. Set aside.
2. Place ground meat at the bottom of a 22cm deep dish (approximate). Pour egg custard on top. Place duck egg yolk in middle.
3. Steam on high heat for 7 minutes. Open cover and use spoon to poke all around the egg mixture (to release built up steam in egg). Garnish with spring onions if you like and continue to steam for another 3 minutes (which makes 10 minutes in total). Serves 4 as a meal with rice and other dishes.