The idea of roasting testicles until they pop sounds a bit scary. In the abbatoir one of the tools I had was a long iron hook with a pointed tip - this was mainly used for fishing out sets of intestines that had missed their intended tray on the conveyor and rolled underneath among the machinery. Testicles occasionally fell off too. It took a hard whack with the hook to burst their tough membrane, but when you did the tissue inside burped out like an enormous zit popping. You wouldn't want to be nearby if the burst was under steam pressure. Having to go through life explaining how you lost your eye to a flying dollop of scalding testicle might be embarrassing.