Well you either record the way you'd record a normal sample but with a fry at the beginning, or the end. ( '
い or
い')
Ex:
https://clyp.it/brjyq1zf
Or like a transition between vowels like an "a' い" where the "a" would fade into a fry, which fades into an "i" if that makes sense.
Most people just record fries for vowel and n sounds, but I suppose you could do more if you wanted