It's hard at first to figure out where the game expects you to drag and drop things (took me a few minutes of guesswork to understand that you're supposed to drag the rolls over the wrapping before handing them over). Maybe you could highlight the valid drop spots?. The pepper icon on the order paper is green, which makes it easy to confuse with lettuce at a glance
I also encountered a bug earlier where opening and closing the help screen deleted the roll I had on the folding table, but I can't reproduce it.Once you get the hang of it, though, the gameplay is pretty fluid and a well executed copy of what it's parodying.