Rhubarb Pie

Bahan-bahan (6 porsi)

• 1 double pie crust (store-bought or homemade )
• 1 cup granulated sugar (+ 1 tablespoon)
• 6 tablespoons all-purpose flour (divided)
• 6 cups rhubarb (cut into ½ inch pieces)
• ½ teaspoon cinnamon