Shemos (34:26) You shall not boil a kid in its mother’s milk.
Igros Moshe (YD I #42) Question Washing dishes in the sink. Is a single sink permitted? Answer: Even if you want to claim that a Bal Nefesh should be strict and not wash dishes in a single sink this is not the normative halacha to a person who only wants to do the minimum because most sinks can not actually be prohibited and thus it is not prohibited even to a Bal Nefesh. Also most times the dishes are not actually touching the sink but rest on a racks which are separate for meat and milk. Even if occasionally that the sink water rises to touch the dishes. This is only a concern lechatchilah but bedieved it is not a problem even for a Bal Nefesh. Thus even though the custom is to have separate sinks it is not prohibited to have a single sink.
In one of R' Yisroel Reisman's shiurim on kashrus, he talks about how he was asked a shailoh about a pot just before Pesach. According to the halakha, he determined that the food was okay and the pot could be kashered, only for the woman asking to tell him she'd already thrown out the food and put away the pot until after Pesach. She just wanted to know if the pot that had been next to it on the stove also needed to be kashered.
ReplyDeletePeople don't know the halakha and are strict. Over time, that unnecessary stringency becomes the new standard. So yeah, today if you don't have two opens, two stoves and two separate (not adjacent, chas v'chalilah) sinks, you're not keeping kosher.