There is a difference of opinion among sefardi and ashkenazi poskim regarding bishul akum. For ashkenazim it is enough if a Jew lights the oven and a non-Jew cooks the meat. For sefardim, a Jew must ...
Prepared mustard (containing vinegar and the like) is certainly not kosher for Passover. According to Ashkenazic practice, the mustard plant itself is included in "kitniot" and prohibited on ...