Bishul Akum questions

Kavod HaRav,

I had two questions regarding the laws of bishul akum which is on this site:
You wrote “If there are combinations of ingredients and some would be OK, while some would be a problem, we would go after the main item(s) if cooked together by a Non-Jew.”
2. "If a Jew lights the oven, it would be permitted for Ashkenazim; but Sephardim cannot eat that food except when the Non-Jew is an employee at the house or restaurant of a Jew.
Could you expand on both of these?

Number 2 was explained a bit more clearly in another post of yours.

In response to the first question…

If you have a creamed vegetable soup that was cooked by a non-Jew and you are sure that the ingredients are kosher, them there would not be a problem of bishul Akum. The water is the majority and there’s no bishul Akum on water.
The same goes for coffee.

So why wouldn’t this apply to sushi?

Not sure what you’re asking…

For #2 in essence according to what’s written there’s no difference between the conditions of an Ashkenaz and Sephardi. Any non Jew cooking the food is in one way or the other any employee. Now regarding a maid, is the only way she could cook if a jew turns on the fire? If yes, what’s the status if the food cooked by someone’s maid purely? Let’s say you go to someone’s house and you know they didn’t turn on the fire. And how about different cooking appliances like microwave, toaster, crock pot, etc?

Please clarify the first question.

As far as types of pots and ovens and the like, some people try to differentiate, but ultimately cooking is cooking and they’re all the same.

The first question was what’s the difference between Ashkenazi and Sephardi halacha if in both cases the jew has to turn on the fire?

And can you eat food at somebody’s house if their maid cooked the food and initiated the flame?

If a Jew lights the fire in a non-Jew’s home and the Non-Jew does all the cooking, it’s ok for an Ashkenazi and not OK for Sephardim.

Question 2… nope

If lets say there’s a raw vegetable roll (i.e. cucumbers or carrot) so the vegetables comprise a majority of the roll. If the rice is a minority and you know it’s all kosher. Is it okay to have if the rice wasn’t cooked by a jew?

It only works if it is mixed in.