2,432. Mixtures of Permitted and Prohibited Foods

Maachalos Assuros 14:19

The reason the preceding prohibitions accumulate is because, while it was prohibited to eat the fat, benefit was permitted. Once it was consecrated, deriving benefit from the fat became prohibited. Since this prohibition it was added to it, the prohibition against consecrated items was added to it. While this fat was prohibited to a regular person, it was still permitted as an offering. Once it became nosar, since it was prohibited as an offering, that prohibition was likewise added to a regular person. A person was permitted to eat this animal’s meat if not its fat but when he was rendered impure, since its meat became prohibited to him, this added still another prohibition to its fat. Finally, once Yom Kippur started, all food became prohibited. Since that prohibition includes secular foods, it likewise adds a prohibition to this fat. The same rules apply in all similar cases.

Maachalos Assuros 15:1

If something prohibited gets mixed with something permitted of a different kind, it’s prohibited if its flavor can be tasted. If the two things are of the same kind so that it’s impossible to differentiate its flavor, then the forbidden thing is nullified if the permitted thing is the majority.