Cucumber Mint Water

Put the mint leaves and sugar in a small pot and crush the leaves with a wooden spoon. Pour in the boiling water and stir until the sugar dissolves. Set aside to steep and cool for 15 minutes. Meanwhile, in a blender, purée the cucumber with 2 cups cold water. Strain the cucumber liquid and mint liquid through a fine strainer into a large bowl; discard the solids. Pour the liquid into a large pitcher. Add the lemon juice and 3 cups cold water; stir to combine. Serve over ice.