Food is always a good business as obviously everyone has to eat.
A lad I know was telling me his mate had a few doughnut vans that frequent Sunday markets and any other event he could get to and it's all cash payments.a biker meet up I used to go to which happened on a Thursday night had over 1000 bikes turn up it was like a food festival huge catering vans there etc.big money in food.
Just found a video of the place on YouTube.thats early evening looking at the numbers there.them vans would take £1000s on the night no doubt..