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I've done food stalls at food festivals, they're good fun if you take it for what they are. You get a lot of moany stall holders who cant adapt and all want perfect pitches. If you can adapt you can do alright. You can also make a killing. Or just cover your costs when it rains, if youre lucky. Worth a shot though. I saw a bloke selling good quality cheddar on big lumps of toast for a small fortune. People were queuing for it all day long. I think it was something he did on the side. So it wasn't like he gave anything up for it. But it would have afforded him less days at the 9-5 for sure.
have you considered pop up food stall at market, or turning your flat/room into a diner once a week?