Today we take for granted how many restaurants there are to choose from, but how long has the concept of "going out to eat" existed?
At what point did people start preparing meals as a means for income?
Your question is very similar to one in the FAQ: "What was the first culture that developed restaurants?" https://www.reddit.com/r/AskHistorians/comments/1637aw/what_was_the_first_culture_that_developed/c7sc6p4/ has a short, but concise answer by /u/EastHastings that at the very least, gives you an upper bound for the earliest restaurants (Song or earlier).
If this does not answer your question, you can try to rephrase it more exactly.