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: 20 minutes
Cook: 5 minutes
Prep: 20 minutes plus 30 minutes resting of pastry and 3
Cook: 10-15 minutes plus 2 hours for the caramel
Prep: 30 minutes
Cook: 1 litre