Learn Arabic (Modern Standard): مساء النور، أهلا وسهلا في المطعم.

مساء الخير (literally "evening of goodness") is the standard greeting. مساء النور (literally "evening of light") is the standard reply to that greeting. In this sentence, the speaker is likely responding to someone who just said "good evening" first.

What do the words in أهلا وسهلا literally mean?

It is the standard phrase for "welcome", but literally أهلا means "family" and سهلا means "ease" or "flat land". It comes from an ancient welcoming phrase meaning "You have come to your own family and stepped on easy ground."

The English translation says "welcome TO the restaurant," but doesn't في mean "in"?

Yes, في translates directly to "in" or "at". While English speakers say "welcome to a place", Arabic speakers say "welcome in a place". Trying to use the Arabic word for "to" (إلى) here would sound unnatural.

Is the word المطعم (the restaurant) related to the Arabic word for food?

Yes! It shares the same core root letters (ط ع م) used for words related to food and eating, like طعام (food). Adding a مـ sound to the beginning of a root is a common way in Arabic to describe "a place where an action happens" — so it literally means "a place of eating".