Mechanically, your pcs would need checks with both the heal skill and then either knowledge arcane or spellcraft.
Flavorwise....take a peice of fresh (never frozen) chicken breast with the skin on, and microwave it on the highest setting possible. Watch it cook though the glass. When it gets to the point were ,if you were the chicken, you would hope that you were already dead, stop. Open the microwave, take a good long look, and then describe this from memory to the pcs.....don't forget the smell, humans do taste like chicken after all....