Please Remind Me -- Halachic Question

[gnomi]

Hypothetical situation: I have something (say a cake, just for example sake) that requires an hour to bake. Can I stick it into the oven at, say, 45 minutes to shabbat and let it finish its cooking during shabbat? Is there a specific percentage that it has to be cooked before shabbat comes in? Assume timed bake or that leaving the oven on over shabbat is not a problem.

We tend to (a) do cooking Thursday night and just be warming stuff up and (b) be using the hotplate and not the oven, so I haven't contemplated this recently. I seem to recall something about cholent having to be 100% cooked or 100% raw before shabbat, but I'm not at all sure about that.

Comments

Re: Relighting

[estherchaya.livejournal.com]

And I think that if your light blew out accidentally (in a spot which normally doesn't get a draft) there would be nothing wrong with someone else relighting it, with a bracha, and fulfilling the mitzvah. The mitzvah is on lighting a lamp that will, under normal circumstances, last the half hour. Once it's lit, even if it goes out immediately, you're done.

If your light blows out accidentally, but there was originally enough oil/candle to burn for the required period of time (at least 30 minutes post-nightfall) you don't have to relight it at all. But if someone wants to light their own candles/oil with a bracha using your leftover candles/oil, they may only do so if there remains enough oil/candle to burn for at least 30 minutes post-nightfall. The mitzvah is counted at the time of lighting in this case, so if the proper conditions are met at the time of lighting, all is well.