I help run a hotdog stand in NYC with my uncle in the summer on the weekends for fun and (ridiculous) profit.
On a similar note, I was looking at the difference in fruit prices between 'whole' fruits and sliced portions in super markets the other day and started daydreaming about selling portions of pineapple on warm summer days, much like an ice cream stand but with pineapple. I think the markup is similar to hotdogs - can you share how many customers you serve in a typical hour?