1. Get a cooking pot, fish fillets and a energy source like a Portable Gas Stove or Fireplace.
2. Put the fillets in the pot (optionlly together with some other meat like chicken breast or cow steak for comparison)
3. Put the pot on the energy source and see how it's getting heated up (turning red)
4.Look inside the pot and see how everything else is getting hot (red background) just the fish fillets won't.