Combine rum, apple cider, Licor 43, simple syrup and lemon juice in a large container and stir.
Chill for at least 2 hours. (Can be chilled overnight.)
Before serving, float apple slices on top.
To serve, pour over ice.
Notes
Cocktail can be made up to 24 hours in advance and stored in a sealed container in the refrigerator. Just add the apple slices right before serving.
A note on the provided nutrition information
The nutrition information provided has been estimated by an online nutrition calculator and is not a substitute for a professional nutritionist’s advice.