When Taboylan mentioned in passing that it would be possible to eat the tallow candle in his PSK, it reminded me of some latent knowledge I had in the back of my mind.

Some foods (nuts and marshmallows come to mind) could be used as tinder in an emergency. A single shelled peanut saved from your trail mix contains a surprising amount of energy and easily could be used to get a fire going when everything else is soaking wet.