National Strawberry Rhubarb Pie Day is observed in the USA on June 9 each year. This day celebrates the combination of rhubarb and strawberries, which is considered a delightful spring treat. Rhubarb, originally from northwest China, was cultivated for medicinal purposes and made its way to Europe before being introduced to the USA by Benjamin Franklin in the late 1700s. The tart flavor of rhubarb pairs well with sweeteners, making it a popular ingredient in desserts like ice cream, jam, and particularly pie. On this day, people often bake strawberry rhubarb pies to enjoy the seasonal flavors, while being mindful not to use rhubarb leaves, which are mildly toxic due to oxalic acid.