Sorry, jerky is MC slang for 'rotten zombie flesh'
That can get a bit confusing when there could be a mod that adds food that is officially called "jerky" (in fact, I searched the FTB wiki, and apparently TiCon allows making several kinds of jerky on the drying rack).
Anyway, rotten zombie flesh (called zombie brain when using the PureBDCraft resource pack) can also be centrifuged for methane, though less per item than other foods.