This concept is presented really well. The environment and music sets a great mood and all the possible ingredients lead to a lot of funny sandwich combinations.
I don't want to "pile on", but I agree with some of the other comments about the spawning in the ingredients. I could mostly click in one place, and there was a bit of difference depending on how quickly or slowly I clicked, but it still didn't feel like I had a lot of control over how successful the sandwiches were. Also, the rent prices scale up pretty quickly, so I think 9 days was my longest run.
Overall, it was a fun take on the theme and a lot of potential as an idea.