One who owns chametz in their shop, and it would be impossible for them to remove it from their shop and sell it to a non-Jew, should be careful to sell it according to the law. They should receive money from the non-Jew and say explicitly that they are selling such-and-such chametz that is placed in the shop. They should also sell any of the vessels in which the chametz is placed, for if not, it would not be a valid transfer of ownership. They should give the keys of the shop, and say explicitly: you may enter the shop at any moment, and can do with the chametz as you wish, as one does with one's own property, and none shall protest. However, it's preferable not to sell one's chametz but to give it as a gift. The chametz and the vessels they are placed in should be given as an absolute and wholehearted gift to a non-Jew, and the keys should be given to the non-Jew so that they may do with the chametz as they please. A gift is more correct, for many people do not do the sale properly. All this should be done on the morning of the 14th of Nissan, just after the morning prayers so that one does not forget due to distractions. Even if the non-Jew gives back all the chametz after Pesach and did not use it at all, it does not matter since the ownership was legally transferred. Those who own sweets that contain flour should not keep them at home, but should either sell or give it to a non-Jew, even if they eventually give it back after Pesach. The same applies to the grain called Burjil [burghul: steamed cracked wheat], and the beverage known as bira [beer] -- these need to be sold or given over absolutely to a non-Jew, and should be brought to their house. If one erred and did not give or sell chametz before Pesach, these items are forbidden for use after Pesach is over. However, sugar from the cities of India, and qand [ﻗَﻨﺪ, sugar cubes] that comes from the cities of Europe, as well as the food known as nabat [long rock candy for sweetening tea] - all these can stay in the home during Pesach, yet may not be eaten during the festival. One who has chametz in a trading caravan or on a ship should sell it with money and a contract, and should come before a rabbi who can help them formulate the contract.