Disposing of the Challa
Question: What is the best thing to do with the challa that one separates? Should one wrap and dispose of it or burn it in the oven? Answer: Rambam (Bikurim 5:13) writes that the challa which one is supposed to separate and give to the kohen is akin to teruma . Just as teruma which becomes tamei must not be eaten, so too challa nowadays may not be eaten as we are all presumed to be tamei . Likewise, any dough that came into contact with water or any of the other seven liquids would be tamei (See Mishna, Machshirin 6:4) . According to Rambam (Yom Tov 3:8), there is a mitzva mideoraisa to burn this tamei challa (See Tosafos, Shabbos 24b). In chutz la’aretz where this mitzva is only miderabanan, the requirement to burn it would also be miderabanan. Thus, the Rema (YD 332:5) writes that nowadays we burn this dough. As only kohanim may benefit from challa , it must not be baked together with other bread, though. While the Shach ( YD 108:1 quoting from the Issur Veheter) ...