Reply To: Chidushim on Daf Yomi Shabbos 30

שבת עד,ב

Rashi’s view is that cooking less than the shiur is considered a half a shiur and is assur biblically. The problem is how is it חזי לאצטרופי, cumulative? If we write one letter I can see it by adding another letter but cooking less than a shiur where the shiur is determined when we put it in the pot. The Chacham Tzvi 86, says that by chametz baal yiroeh for less than a shiur does not apply. Maybe the reason is achshevei, putting a value on it by doing it but that only applies according to Rebbi Shimon who according to the Maharshal holds that eating a shiur שלא כדרך אכילתו, not the normal way, is assur as eating a half a shiur.