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: 5 minutes
Cook: 10-15 minutes
Prep: 10-15 minutes
Cook: 50-60 minutes
Prep: 20 minutes plus 1 1/2 hours resting of the pastry
Cook: 30 minutes