Question:
Is it mutar to use an egg white left overnight? e.g. if I separate an egg to use the yolk in a recipe, can I leave the egg white in a cup in the refrigerator overnight (or few days) for later use?
Answer:
Lechatchilah you should add salt or sugar to the egg white if left over night.
Sources:
Gemorah Nidah 17a, Teshuvas Shevet Halevi 3:69
If I didn’t add anything to the egg whites should I throw them away?
If it isn’t a big loss to you, then throw them out.
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