back to the original question about bal taschis, there is no issur to trow out food. The issur is to spoil food. You dont need to eat something you dont like and you deffinitly dont have to take a second portion just not to make baal tashchis, any piece bigger then a czieyis you trow out in a mennor that dosent cause bizi oichlin e.i. you wrap it before so it dosent get dirty from all the trash.
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