There is an interesting question why we don’t make kiddush on wine and eat some bread on YK which falls on Shabbos. The shiur of eating on YK is a koseves (fig) while the shiur to be yotzei the seuda of shabbos is a kzayis which is smaller. Therefore, according to the man d’amar chatzi shiur mutar min hatorah (that eating less than a shiur is only forbidden midrabanan), wouldn’t the mitzva of seudas shabbos require that one eat a kzayis, which is less than the shiur to violate YK and hence be permitted?
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