Step 1 : Introduction to the question "What did Medieval poor people receive when "souling?""
...As Christianity spread into Celtic lands in the 9th century, it blended with and took the place of older pagan rituals. The church, in 1000 A.D., designated November 2 each year as All Souls' Day. This was a time for honoring the dead. During this time, poor people would go through the towns and villages, visiting the homes of wealthy families to offer prayers for the dead. In exchange, they would receive pastries called "soul cakes." This practice was "souling." It would later become a practice of children, eventually giving rise to trick-or-treating. Source: History.com