We didn't "eat out" much when I was a kid. My mom was a really good cook and besides, it was the depression.
The only thing I remember my folks purchasing outside a grocery store was fried chicken. In this house, which will soon be destroyed to make room for a health facility, another good cook named Mrs. Neighbor (really!) made home fried chicken and sold it from that window on the left. My impression was it was only on Sunday but that may not be correct.
The order was called in from the party line phone - 5555-W - and was picked up. For my mom this was a treat, but I remember her fried chicken was just as good if not better.