if you have a small enclosure without much to obstruct its sight i'd say just use a shallow dish (as advised) and let hunger do its thing. i have a six foot tall display cabinet with vines and all so its not really an option for me so what i've had to do this first five weeks is make them eat. Using a baby food lid with food and supplements, i dip their nose into it a bit and wait. as soon as they start to lick it off their snouts, i have that lid in their in a flash, so as they're licking, their tongue starts to touch the food in the lid. Usually they keep licking and start sticking the tongue way into it to take good licks (that's when you know its working, when you see that whole tongue gettin in there). often they'll start to tilt back their heads as they're licking (probably so gravity can do half the work for them) so i just keep that lid to their mouth and tilt with them. try that and i'll be very surprised if it doesn't work.Once they get into the taste i'm sure they'll start to do it on their own.
G'luck
Brian