The recipe for Croccante, provides more than you need for this gelato. If you grind up only the amount needed for the gelato, the rest will keep for use as a confection. Or grind the whole batch and sprinkle extra on the gelato when you serve it.
Prepare the basic mixture. Cool the mixture, add the ground croccante and rum, and freeze in an ice cream maker.
Pack the gelato in a cold container, press plastic wrap against the surface, and cover the container with a lid. Store in the freezer. Serve the gelato on the day it is prepared for best texture.
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