Duck sang choi bao

Name: Duck sang choi bao
Ingredients: 2 duck breasts, skin removed; 150g pork mince; 2 tbsp peanut oil; 1 tbsp finely chopped garlic; 1 tbsp finely chopped ginger; 2 dried Chinese sausages, sliced; 2 tbsp preserved Chinese mustard greens, chopped; 2 large fresh shiitake mushrooms; 8 water chestnuts, chopped; 4 tbsp shaoxing; 1 tbsp castor sugar; 2 tbsp Chinese light soy sauce; 1/4 cup oyster sauce; few drops of sesame oil; 1 small carrot, peeled and julienned; 1 small Lebanese cucumber, julienned; 1 small handful bean sprouts; 2 long green shallots, sliced; 6 large iceberg lettuce leaves