National Lemon Meringue Pie Day is a celebration held every year. Lemon meringue pie is one of the most popular pies in Great Britain and North America. Lemon custard is usually attributed to the Quakers in the late 1700s. The idea for a fluffy topping made from sweetened and flavored egg whites goes back to the 17th century in France. The first mention of Lemon Meringue Pie in a cookbook was in 1869, but often, during that time, these custard pies were also referred to as “lemon cream pie.”