Rum, slightly sweetened and flavoured with the lime and clove flavours of falernum.
There is much debate over the Corn 'N' Oil, particularly the type...
I had this in a rooftop bar in a hotel in Albuquerque that had been a hospital. I finally found a recipe book that had it and I can't remember its name, but it's somewhere in my library. If you know it, you could save me time. It's a pretty good and surprisingly named drink.