Very good lunch-special burger at RMB 58

Beijing has some good burgers but the problem seems to be the beef patty. Very few restaurants in town are able to put a finely chopped beef patty between the buns. Most restaurants use minced beef patty, and the quality is usually not very impressive. 

Kerry Kitchen's has the best beef patty so far I've ever had in Beijing, and it's farily priced at RMB 58 during lunch.