Actually, I think it works better when we let the sounds speak for themselves. No descriptions, a coward's imagination is much better at scaring him than you can ever hope to be. guts and stuff might actually not be necessary. In fact absence of gross remains might imply that not enough is left over.
For the record, the ginger beer trick merely consists of making some insinuations (preferably showing the prisoners a big supply of ginger bear), picking out the one that seems most scared, then taking all of the other ones, one by one, to a separate room. Then one makes a disturbing sizzling sound and another screams as if he was being burned alive. Repeat for every prisoner, the plan being that by the time the last one comes around, he'll spill it all the second you touch him.