As mentioned in the previous post on the '
Sailor's Cross Knot', adding a small 1/8" x 2"
firesteel to the vertical section of the cross is easy to do. For this project I made a Sailor's Cross Knot lanyard/fob/zipper pull, with swivel clip for attachment, jute cord inside the paracord, and a removable/replaceable firesteel in the vertical section of the cross, shown with a
Wenger Evogrip 18 Swiss Army Knife. I ended up using less than 5 feet of paracord, and double that length of
jute twine(Thanks for the roll of twine, Manny!). An
Arms-Akimbo knot was tied with the single strand coming out the bottom of the cross.

I first replaced the paracord's inner strands with
jute cord, which can be pulled apart and made into a nest to use as
tinder to catch a spark from a firesteel or
flint. From that you get a flame that you use to get kindling burning, then add in larger bits of sticks, branches, and logs for a sustainable fire.
I'd seen a
video, done by fellow knot tying friend
Ken earlier this year, showing some wax/paraffin treated jute twine being pulled from a wet section of paracord and lit with sparks from a firesteel. I didn't give the jute for this project a wax coating, but it's certainly a useful idea, giving the jute a longer burning time like a candle wick, to help in getting a fire started.
I added the jute to the paracord by tying one of the inner strand ends to the center of a length of doubled up jute, then pulling the inner strands out one end, and the jute replaces the twisted nylon core strands. Depending on your paracord's outer sheath, sometimes the inner strands don't fill up all the space inside the core, so you may be able to leave some of the core strands in with the jute, for later utility use, or you might have to pull them all out to make room for the jute, depending on it's diameter as well.
Jute has been made for centuries, and paracord has been around 70+ years, so their uses in knot work are as old as they are, but the internet has plenty of search results to explore for more recent combinations of the two, like this
example from 'The Paracordist'.
If you don't have a lighter or matches, learning primitive fire making
and survival techniques can help you use a firesteel to get a fire
going. There are literally millions of hits Googling those topics, so
if you get sidetracked, have fun but don't get burned. Fire can be
dangerous, so be safe with it.