From: Rabbi Moshe Sofer
To: Rabbi Yisrael
A young scholar questions Tosfos's distinction between food on coals versus in a pot regarding the concern of stoking coals (shema yechateh). The Chasam Sofer resolves this by distinguishing between partially cooked and completely raw food, and raises a novel question about whether food improperly left on a stove becomes muktzeh.
Source: Shu"t Chasam Sofer OC §78