Citrus Slush

This is another recipe from my Aunt Yvonne. She made this for a special meal (Thanksgiving? Christmas?), and then I replicated it again when my husband's family came last summer. One of the best punches out there! This makes a lot; make sure you have a large punch bowl! Please note: this recipe needs a night to freeze.

Ingredients:
2.5 cups sugar
3 cups water
12 oz. can of frozen orange juice concentrate
12 oz. can of frozen lemonade concentrate
12 oz can of pineapple juice concentrate (or 46 oz. pin. juice)
3 cups cold water
2 2-liter lemon-lime soda, chilled (4 qts).

Directions:
Over high heat, bring sugar and 3 cups of water to a boil. Stir until sugar dissolves. Remove from heat and stir in juices and 3 cups cold water until well blended. Pour into 2 9x13" baking pans or pint freezer boxes. Cover and freeze overnight until juice mixture is firm, then cut each pan of frozen juice into 24 squares. Place in a 2-gallon punch bowl. Slowly pour chilled soda over squares in punch bowl.