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: 30 minutes plus 2 days curing
Cook: 8-10 Portions
Prep: 15 minutes plus 3 hours freezing
Prep: 15-20 minutes
Cook: 30-40 minutes