Treats and lots repetition of course!
Kitties, dogs, ... humans? I thinks so. Only difference is humans, supposedly being smarter, require treats for life ie. tricks never become a sustained learned behavior without the treats. Additionally, "reward" has to become increased over time. Applies to many of the comments in this thread...
Back to the tiger, this trick is kind of similar to training your dog to let a treat sit on it's nose until you give it the command to react and snap it off out of the air. No different than this particular cat trick... we are just seeing a pic from the early stages of the "trick/treat" training system. Start off simple and it will take lots of time and "treats" to get to the final trained behavior. Big, wild cats being more difficult to domesticate require a little more patience and treats to get to the final "performance". No problem, lots of treats available in that neck of the woods!!!
With big cats, this trick should be taught outside... kind of messy(or at least on linoleum if it has to be performed inside!)
