הלכה על ביצה 56:16

From the laws of the commandment is that which they, may their memory be blessed, said (Beitzah 28b) that even though Scripture permitted work for the sake of food for the soul, it is specifically things that are impossible to do from the eve of the holiday, such as kneading, slaughtering, baking [and] cooking - as all of these types of work become a little defective from delay [after them]. And likewise for this reason, they permitted to pound spices on the holiday, on account that their taste becomes fainter with delay after they are pounded. But it is forbidden to do types of work on the holiday that are possible to do from the eve of the holiday and do not deteriorate at all - such as harvesting, threshing, separating, grinding, sifting and what is similar to them; and they are not included in the needs of food for the soul at all. And we administer lashes for them like [for] plowing in the field - which is actually a work of labor. And the later commentators elucidated this matter further and said that truly that which is called the need of food for the soul is only that which is made for its day - meaning to say, for a short time, like cooking and baking and what is similar to it, as we have said - and also [only] that which a person's mind relies upon to make for that time. [This is] to exclude hunting, as the mind of a man is not upon it, since perhaps game will not appear to him today. And they said further that that which we permit food for the soul with that which is made for that time - as we said - is only if he uses the body of the work. But if he uses the removal of the work, it is forbidden. And this is [the understanding of] that which they, may their memory be blessed, forbade (Beitzah 22a) to extinguish the log, even though his mind in extinguishing it is so that [the stew in] the pot not get smoky. And regarding the roasting of meat over coals - which is the bisra agumrei mentioned in the Gemara (Beitzah 23a) - even though the fire is extinguished from the [liquids] of the meat, this is not called using the removal of the work, since it is for the needs of the roasting to do this. And [so] he is using the body of the work and it is permissible.