1: Cut the limes pole to pole and juice to provide ¾ cups lime juice.
2: Hollow out each lime using a small pairing knife or kitchen shears.
3: In a pot, combine water and sugar over medium heat, stirring until sugar dissolves.
4: Remove from heat and stir in gelatin.
5: Add the lime juice and 2 mint stems with leaves, then steep for 12-15 minutes.
6: Remove the mint stems after 15 minutes and stir in the rum.
7: Fill each lime shell with the mojito mixture.
8: Place in the refrigerator and allow to set for at least 3 hours.
9: To serve, cut each lime in half and sprinkle with chopped fresh mint.
