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: 2 hours plus setting time
Cook: 30 minutes
Prep: 10 -15 minutes
Cook: 30-40 minutes
Prep: 5 minutes
Cook: 1 1/2 - 2 hours