The type of law involved would be Private & Civil Law. Due to the fact that costumer did not die, there is no ability to charge for criminal law under manslaughter. The only paths available is to sue under Private and Civil Law. Remember, a private law is one that mainly involves lawsuits between private individuals or groups. In this case the restaurant and victim. Civil law is very similar, as it deals with members of the community and not criminals or governments.
I hope this helps! :)
