One of the main expat hangouts in Xujiahui, Blue Frog has been in Shanghai for more than 16 years (making it practically ancient). The reason it's still going strong is its well-prepared American dishes, including the mile-high burger (stacked with a double patty, bacon and cheese), steak, pasta and good breakfasts.
The happy hour is popular, with buy-one-get-one-free drinks from 4pm to 8pm daily.