1. Use a pressure cooker. It takes 20 minutes.
2. Use a regular pot. It takes at least 40 minutes.
3. Use a casserole dish. It takes 1 hour to 1 1/2 hours. In addition, different cooking methods may also lead to differences in the time required, for example, some methods may start with a boil over high heat, then turn down the heat and simmer for 30 minutes before reducing the sauce over high heat. After adding warm water, slowly simmer the ribs over medium-low heat for 10 minutes, and once all the flavors of the ingredients in the pot have simmered out, you can clip out the sesame leaves, ginger, star anise, and green onion knots, which can turn black if simmered for too long.