This is an interesting idea. Cross comparing similar dishes seems right up your alley too (“if you like X at Y, then you’ll love Z at Q!”).

What’s the end game though? How would you deal with one or more of these companies refusing to give you an affiliate / referral fee?

I ask because something like this has value in aggregate but once you achieve some level of traction it’s user hostile to have a series of dishes or restaurants “disappear”.