1 cup freshly squeezed lemon juice (5 to 6 lemons)
1/2 to 3/4 cup superfine sugar, to taste
1 cup crushed ice
4 cups water
2 teaspoons grenadine
6 maraschino cherries
Place the lemon juice, sugar, ice, water, and grenadine in a blender and process until completely smooth. Place a cherry in the bottom of 6 glasses and pour the lemon juice mixture in the glass.