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Label accordingly, with the current date. Leave a 1" (2.54 cm) room at the top for expansion.
Combine a cup of sugar and two cups of water in a medium pot. Bring the mixture to a boil, stirring constantly and allowing the sugar to dissolve. Allow the mixture to completely cool on the side. Add the mango pieces in freezer-friendly Tupperware containers. Pour the simple syrup over the mango. Freeze the mangoes up to 12 months.