nono, Its all synthetic, and trying to burn it I discovered its fireproof. Its here because the original barbecue made of bricks was ruined by the sun and water, and this layer has reinforced it.
Discussion
hah. weird... man, weird things are weird
so weird😅 but effective, now can sustain all the stress of being in open-air without problems

ohhh it must be glass fibre or something
it's there to hold the concrete together
none of my business but if it was mine i'd get wire cutters and remove all the hairy bits, they just look weird, and all i can think of is weathering causing a bit to fall off and get blown onto the food and next thing you know you swallow it or it gets caught in your teeth and it turns out to be something unsafe to eat
agree with you, will remove it