Whilst hot cross buns pre-date Christianity, they were historically only eaten on Good Friday as a Christian symbol of the crucifixion. However, they are now widely available and eaten throughout the year. Hot Cross Bun Day encourages you to consider the roots of the hot cross bun, and to take a day to enjoy hot cross buns.
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All details taken directly from provider content at http://www.daysoftheyear.com/days/hot-cross-bun-day/