Aleppo soap (also known as savon dAlep, laurel soap, Syrian soap, or ghar soap, the Arabic word "غَار", meaning laurel) is a handmade, hard bar soap associated with the city of Aleppo, Syria. Aleppo soap is classified as a Castile soap as it is a hard soap made from olive oil and lye, from which it is distinguished by the inclusion of laurel oil.
Traditional Aleppo soap is made by the "hot process". First, the olive oil is brought into a large, in-ground vat along with water and lye. Underneath the vat, there is an underground fire that heats the contents to a boil. Boiling lasts three days while the oil reacts with the lye and water to become a thick liquid soap.
The laurel oil is added at the end of the process, and after it is mixed in, the mix is taken from the vat and poured over a large sheet of waxed paper on the floor of the factory. At this point, the soap is a large, green, flat mass, and it is allowed to cool down and harden for about a day. While the soap is cooling, workers with planks of wood strapped to their feet walk over the soap to try to smooth out the batch and make it an even thickness.