2 cups water
1 cup sugar
2 cups grapefruit juice
1/2 cup grenadine syrup
1 tablespoon lemon juice
Lemon-lime soda
Lemon slices
Maraschino cherry
Boil sugar and water together; stir until sugar is dissolved. Remove from heat; add grapefruit juice, syrup and lemon juice. Freeze mixture. When ready to serve, chop mixture and put into serving cups. Pour soda over mixture. Garnish with lemon and cherries.