Chinese Braised Beef Shank

Name: Chinese Braised Beef Shank
Prep time: 15 min
Cook time: 1 h 40 min
Total time: 1 h 55 min
Cuisine: Chinese
Ingredients: 1 beef shank ( , around 1500g, bone removed); 2 L beef stock; 4 tsp. dark soy sauce; 4 tsp. light soy sauce; 2 leek onions; 2 green onions; 1 thumb ginger; 2 shallots; 1/3 cup shaoxing wine; 20 g rock sugar; 4 star anises; 2 small piece of Chinese cinnamon; 4-6 bay leaves; 1/2 tsp. Sichuan peppercorn; 4 cloves; 1/2 tsp. whole cumin seeds; 1/2 tsp. fennel seeds; 1 cardamom; 3 Amomum Cardamomum pods; 1 Amomum tsaoko; 2-3 dried chili peppers (optional)