National Rhubarb Pie Day is observed worldwide every January 23, celebrating the delicious rhubarb pie, which is often overlooked despite its popularity. The origins of rhubarb pie date back to 18th century England when sugar became more accessible, and the plant was introduced to the United States in the 1770s by Benjamin Franklin. By the 19th century, it was commonly referred to as the "pie plant" in American cookbooks due to its frequent use in pies. To celebrate, people often bake rhubarb pies at home or purchase them from bakeries, and they may host pie bake-offs or share recipes on social media using hashtags like #NationalRhubarbPieDay. Rhubarb, typically prepared with a bottom crust and sometimes a top crust, is known for its tart flavor, which is balanced with sugar, and it is often combined with fruits like strawberries. Notably, strawberry rhubarb pie has its own celebration on June 9, during the strawberry season.