01 -
Place the shredded coconut in a dry skillet over medium-low heat. Stir for 2-3 minutes until golden in spots, then transfer to a plate.
02 -
Add the pineapple, brown sugar, and salt to the same skillet. Cook over medium heat for 5-7 minutes, stirring occasionally, until the fruit is glossy and lightly caramelized.
03 -
Remove the skillet from the heat. Stir in the lime zest and lime juice, then let the pineapple cool until just slightly warm or room temperature.
04 -
Warm the cream of coconut, pineapple juice, optional rum, and lime juice in a small saucepan over low heat for 2-3 minutes, whisking until smooth. Cool for a few minutes before using.
05 -
Divide half the cookie crumbs among 4 chilled glasses. Add one scoop of ice cream, spoon over pineapple and sauce, then repeat with the remaining crumbs, ice cream, pineapple, and sauce.
06 -
Top each sundae with whipped cream, toasted coconut, a cherry, and a pineapple wedge if using. Serve immediately.