Soul-ing, on All Souls’ Eve (Typically November 1st), was when children and adults would go door to door begging for soul cakes or other treats. Some local customs would have an accompanying play, but most included performance of this song (or something similar):
Journal of the British Archaeological Association (1801, vol. 5). The journal points out the emphasis on beer.
These were old, medieval traditions, not new to the Regency, but still commonplace until the 1930s. Soul cakes, or soulmass-cake, were a part of the festivities, in addition to beer and apples, and traditionally only made for Halloween, All Saints Day and All Souls Day to commemorate the dead. Some places in England continue the tradition of making these sweet treats, including Sheffield and Cheshire (Soul cake – Wikipedia).
Soul cakes were round, small cakes (similar to oat cakes) that resembled a shortbread biscuit in appearance and texture. Here is a video recipe:
We have a few past post about All Hallow’s Eve and the customs of Regency era people:
Regency Culture and Society: All Hallow’s Eve Part II – Regency Reader (regrom.com)
Regency Customs: All Hallows Eve and Nutcrack Night – Regency Reader (regrom.com)