Unit 2: What Kind of Cooking Creates the Prohibition?
Introduction
In the previous unit we learned that the Torah forbids cooking meat and milk together, and that eating or deriving benefit from the mixture is also forbidden — but only when they were cooked together.
In this unit we clarify what counts as “cooking” for this prohibition.
The Basic Rule
The Torah uses the language of bishul (cooking).
Therefore, the full Torah prohibitions of cooking, eating, and benefit apply only when the meat and milk are cooked together in a manner that is considered derech bishul — the normal way of cooking.
Classic cooking in a pot with liquid is clearly included.
Other Methods of Cooking: Roasting, Grilling, and Frying
The poskim discuss whether other common methods of applying heat also create a Torah-level prohibition:
- Roasting and grilling (dry heat)
- Frying (in oil or fat)
There is a significant dispute:
- Some authorities rule that these methods are considered derech bishul and therefore create a full Torah prohibition (cooking, eating, and benefit).
- Other authorities rule that only classic cooking in liquid is derech bishul on a Torah level. According to them, roasting, grilling, or frying meat with milk creates only a rabbinical prohibition (forbidden to eat, but permitted for benefit).
In practice, we treat these mixtures with caution, especially regarding eating.
How Much Cooking Is Required?
Even when the method of cooking is valid, the food must reach a minimal level of doneness.
This level is called ma’achal ben derusai — the amount of cooking that makes the food edible (even if only barely).
Opinions differ whether this is roughly one-third cooked or one-half cooked.
If the meat and milk were heated together but did not reach this minimal level, the full Torah prohibitions of eating and benefit generally do not take effect (though one should still avoid it).
Key Principles
- Classic cooking in liquid creates a clear Torah prohibition.
- Roasting, grilling, and frying are subject to dispute — some consider them Torah-level, others only rabbinical.
- The mixture must reach at least the level of ma’achal ben derusai for the full Torah prohibitions to apply.
Looking Ahead
In the next units we will examine which types of meat and milk are included in the Torah prohibition, and the additional rabbinical restrictions that apply even without cooking.
Stage 1: Torah Law
Immersion in a Mikveh is required for Sacrificial Meat and Terumah, along with a further purification ritual if the priest came into contact with a dead body.
Stage 2: First Temple
Rabbinical introduction of immersing the hands in a Mikveh prior to eating Sacrificial Meat, after each lapse in mindfulness after immersing the entire body in a Mikveh.
Stage 3: Early Second Temple
Rabbinical introduction of pouring water onto the hands (Netilath Yaddayim) or immersing them in a Mikveh prior to eating Terumah, after each lapse in mindfulness after immersing the entire body in a Mikveh.
Stage 4: Late/Post Second Temple
Rabbinical introduction of pouring water onto the hands (Netilath Yaddayim) or immersing them in a Mikveh prior to eating bread or wet vegetables.