Rhubarb pie

Rhubarb pie is a pie with a rhubarb filling.

United Kingdom
Rhubarb pie is popular in the United Kingdom, where rhubarb has been cultivated since the 1600s, and the leaf stalks eaten since the 1700s. Besides diced rhubarb, it usually contains a large amount of sugar to balance the tartness of the vegetable. The pie is usually prepared with a bottom crust and a variety of styles of upper crust.

North America
In the United States, a lattice-style upper crust is often used. This style of pie is a traditional dessert in the country and is part of New England cuisine. Rhubarb has long been a popular choice for pie filling in the Great Plains and Midwest regions, where fruits were not always readily available.

Sumner, Washington describes itself as the "Rhubarb Pie Capital of the World." It is unknown exactly when the city gained this description, although it has been in use since at least the 1930s.

Rhubarb pies and desserts are also popular in Canada, as the rhubarb plant can survive in cold climates.

Variations
A strawberry rhubarb pie  is a type of tart and sweet pie made with a strawberry and rhubarb filling. Sometimes tapioca is used as a thickener.