Cook, stirring occasionally, until the sugar is dissolved and the juice is reduced, 5 to 10 minutes. Set aside to cool slightly before using. Assemble banana split: Place halved banana cut-side up ...

1 ripe banana, peeled and sliced; 60 ml light or white rum; 30 ml banana liqueur; 30 ml fresh lime juice; 30 ml simple syrup (or adjust for desired sweetness) ...