The following hypothetical case was raised in class today:
An American (ashkenazic) Jew is visiting Israel. On Erev Pesach, he has a hankering for sushi (the word hankering was not used in class -- this is my emendation). So he goes to a Sephardic, K for P restaurant. Can he order and eat sushi with rice?
This developed from a broader question -- can a Jew eat someone else's chameitz on erev pesach (so there is no issue of owning it) even if it means accepting any punishment for theft?