The singapore Sling was invented at the famous Raffles Hotel by Ngiam Tong Boon. This recipe is my favourite mix, which I got from the Savoy Recipe Book, printed in the 1930's. The are many other recipes for Singapore Sling, which many can be found on the web.
Prep: 15 minutes plus 3-4 hours freezing
Cook: 10 minutes
Prep: 60 minutes
Cook: 20 minutes
Prep: 30 minutes plus (1 hour for the pastry to rest)
Cook: 15 minutes