If you have Eco Lifestyle, you can also sell juice and seltzer made with the juice fizzer. The other day, it was quite hot (I have the Seasons DLC) and my sim sold a lot of bottles of juice on his own lot!
Since we can carry the food stand anywhere, I make a lot of experiences. I tried in a bar, and it was not successful! 😃 I tried also in a park, and it was popular. It depends on many factors: the location of course, but also the other food available on this location, if the NPC sims are hungry or thirsty, what you are trying to sell at this specific place and time, etc. It's quite fun to play with all the possibilities! 😉