I can see where you've interpreted the limitation, but it doesn't really work for me. While the customer wants two items, and you're giving them two unique items, you're actually giving them four, and I personally believe that breaches the limitation.
The gameplay isn't bad, though like previously said you can just spam click and you get most of the items within the bread, it would also be a good idea to have some sort of indicator when making the sandwich of where to hover your mouse for the items to spawn.
I really like the idea, it's super chill and is visually quite feel-good. I saw you posted a video in the discord of early gameplay and I've been looking forward to playing myself, and I do like what I played. Nice stuff!