Purée the flesh of one mango.
Cut the other mango into cubes and coat them evenly with icing sugar.
Scoop the puree into shot glasses, then place mango cubes on the puree.
Grind the seeds of the green cardamom pods into powder.
Mix lime juice, rum and the powder into a bowl.
In a separate bowl, whip the cream.
Pour the cardamom seeds, lime juice and rum mixture into the cream during the whipping process.
Place the cream mixture on top of the mango purée.
Finally, garnish with lime zest.