1. It takes about 8 minutes to cook regular dumplings and 15-18 minutes to cook frozen dumplings if you don't cover the pot.

2. If you cover the pot, it takes about 5 minutes to cook regular dumplings and 8-10 minutes to cook frozen dumplings.

3. You need to cook the dumplings on high heat all the way through so that the skin doesn't break easily. Add salt to the water to prevent the dumplings from sticking. Add cold water once for vegetarian dumplings, and three times for meat dumplings, or "three openings and three points of water".