Beitzah 14 - Giving presents on a Holiday
Is there any practical difference between the two reasons? - Yes! - if she knows which dish she will cook. According to the first reason, she should have prepared the spices and cannot grind them now; according to the second reason, they would lose their pungency, so she could not prepare beforehand and is therefore allowed to grind them now.
One should not send presents to a friend on a Yom Tov, since people might see them and think that he is sending goods to the market to sell. The only things that are allowed are ready-made portions of food. This is the opinion of Beit Shammai. However, Beit Hillel is not concerned about it. They allow sending animals and fowl, alive or slaughtered, wines, oils, and fine flours - provided that it is not carried by a caravan of three people, because then it looks like trading.
Art: Preparing spices for market By Paul Saint-Jean
