Beijing and Dalian are both famous food cities in China, with many excellent seafood restaurants. The following are some recommended seafood restaurants:

In Beijing:

1. Beijing Hotel: Beijing Hotel is one of the most famous restaurants in Beijing, and its seafood dishes are excellent. There are many kinds of seafood dishes here, including lobster, crab, shellfish, fish fillets, etc. They are delicious and of high quality.

2. Donglaishun: Donglaishun is a famous time-honored restaurant in Beijing, famous for its hot pot and seafood dishes. The seafood dishes here are fresh and delicious, and the service is very good.

3. Sichuan cuisine king: Sichuan cuisine king is a restaurant that focuses on Sichuan cuisine, but its seafood dishes are also excellent. The seafood dishes here are delicious and delicate, which is worth a try.

In Dalian:

1. Wanbao Seafood Restaurant: Wanbao Seafood Restaurant is one of the famous seafood restaurants in Dalian, which is famous for its fresh seafood dishes and exquisite cooking techniques. There are many kinds of seafood dishes here, including lobster, crab, shellfish, fish fillets, etc. They are delicious and of high quality.

2. Fengning seafood: Fengning seafood is one of the famous seafood restaurants in Dalian, which is famous for its fresh seafood dishes and affordable prices. There are many kinds of seafood dishes here, including lobster, crab, shellfish, fish fillets, etc. They are delicious and of high quality.

3. Yaohai Tingtaoge Hotel: Yaohai Tingtaoge Hotel is one of the famous seafood restaurants in Dalian, which is famous for its fresh seafood dishes and exquisite cooking techniques. There are many kinds of seafood dishes here, including lobster, crab, shellfish, fish fillets, etc. They are delicious and of high quality.

The above are some recommended seafood restaurants in Beijing and Dalian. Of course, there are many other restaurants that are also very good. You can choose according to your taste and preference.