People decide where to eat quickly, and they decide close by. Nobody drives twenty minutes to try a lunch special. So a restaurant ad works when it reaches the right person, in the right place, shortly before they make up their mind.
That has three practical consequences. The radius is small. What you show is the food, not the restaurant in general. And the ad asks for something specific: a booking, a message, a visit at a time when the dining room is usually empty.
Since Meta merged detailed interests into broad groups, fine-tuning the audience no longer gets you far. What's left for a restaurant to make the difference is the image it shows and what the ad asks people to do.