Thanks for playing! Glad you enjoyed it :)
Yeah we wanted to build in a self-imposed difficulty mechanic, and give the player the freedom to make it as easy or as difficult as they wish. So technically you can either build the sandwiches while you drive and then drive-by throw them at the customers, which would be faster, but you run the risk of throwing away a perfectly good sandwich if you miss. On the other hand you can do traditional style and drive up, make the sandwich, and throw it right at them, which is slower, but less risk. It's up to the player to decide :)
Cheers!