Pour water into a bowl and sprinkle the gelatin over the top. Let it sit to bloom.
Heat the pineapple juice and cream of coconut until it’s just boiling.
Add the gelatin mixture to the juice and mix until all the gelatin has dissolved.
Remove from heat and stir in the coconut rum.
Fill each shot glass about ¾ full.
Chill for 5 hours or overnight.
Notes
They only stay fresh for two days, so they are eaten quickly.Garnish them with shredded coconut, a cherry or whipped cream.Do not pour directly from the saucepan; let the mixture cool for a few minutes, then transfer to a heat-proof bowl with a spout.