Q & A - WITH RABBI RISKIN
Q: Why do so many people make jam from an etrog? Ithought it was forbidden to derive any personal use from any of the four species, so how can etrog jam be permitted?
A: It is forbidden to use any of the four species orfor that matter any of the decorations of the sukkah for personal use during the chag. These objects are considered "muktzeh" - they have been set aside for the sanctity of the commandment. However, with the conclusion of Shmini Atzeret the mitzvah has already been performed and so the sanctity of the mitzvah no longer applies. Since the etrog is considered to be the premier fruit - hadar - and since the etrog is considered atonement for the primordial sin of the fruit of the tree of knowledge (according to one view of the midrash that forbidden fruit was an etrog), it is considered to be an especially good omen for the year to eat the etrog fruit after the conclusion of the festival.
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