Silk Gourd with Green Soy Beans

Name: Silk Gourd with Green Soy Beans (Qing Dou Si Gua 青豆絲瓜)
Cuisine: Chinese
Ingredients: ½ tbsp Shaoxing wine; Salt; 1 tsp potato flour mixed with 1 tbsp cold water (optional); 150 ml stock; 2 tbsp cooking oil; 45 g Chinese ham or Spanish ham, or 3 rashers of bacon; 1 silk gourd (about 500 g); 100 g shelled green soy beans