8 stalks rhubarb, cut into 3-inch lengths
8 cups water
1/3 cup sugar, or to taste
Fresh mint sprigs, for garnish
In a large saucepan, combine rhubarb and 8 cups water; bring to a boil, and simmer for 1 hour. Strain the liquid, add sugar to taste, stirring to dissolve, and allow to cool. Serve over ice with a sprig of mint.