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If someone cooks meat and milk together at a very high temperature, so that they will be burned to ash, in the time that it takes from getting the ingredients to a hot temperature to the point that they are ash, does this constitute cooking as far as the Isur is concerned with cooking meat and milk together?

Cf. Does an ivory spoon make hot tea non-kosher? for the comment(s) that inspired this question.

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+1. This is relevant (as it indicates) to cooking actual food (e.g., when burning chametz, I suppose, or throwing things in an incinerator). As far as nonfoods, note that the ban on cooking meat and milk doesn't generally apply to taam (AFAIK! CYLOR). – msh210 Aug 20 '12 at 18:47
@msh210, also note that throwing things in an incinerator may not be Derech Bishul. – Seth J Aug 20 '12 at 19:25

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The Chasam Sofer (Y.D. Siman 92) writes that the prohibition of cooking meat and milk together is on the act of cooking, not the outcome. This is in contrast to cooking on Shabbos, which (according to him) is only forbidden if the object being cooking remains in the world. Based on this he explains the ruling of the Meil Tzedoka (Kanfei Yonan Siman 87) that candles manufactured with butter and animal fats are considered basar b’chalav and may not be lit as this is considered bishul; although the act of cooking destroys the basar b’chalav it is nonetheless included in the prohibition.

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According to this answer to a different question, there are 3 issurim regarding basar b'chalav.

1.The issur to cook meat and milk together
2.The issur to eat meat and milk cooked together
3.The issur to benefit from milk and meat cooked together (Such as selling meat cooked with milk.)

So cooking and eating them are two separate issurim, meaning that an intention to eat the food wouldn't seem to be relevant with respect to cooking. If you cook them on the way to burning them, you are only doing 1 of the 3, but it's still assur.

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But just because they are all assur doesn't mean that we don't learn from one to the other (which we do, eg YD 87:1). Perhaps cooking is only assur if there is intent to make edible food. Perhaps also the cooking is similar to Shabbat and the cooking in this case would be patur similar to davar sheino mitkavein or something like that. – Double AA Aug 20 '12 at 20:51

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