” If there are food left over its because you didn’t like it. ”
No, Deiyezooger. That’s not the case at all. MIL will overprepare (as all balebustas do) and all the participants will take less than they would do under normal circumstances (because they have been coached to do, so as not to look boorish).
Hence, enough food for 3 days of lunch. Pass the ketchup!