Cut banana in half, remove the peel and discard it. Cut it in half lengthwise and set aside.
In a small saucepan over medium-low heat, add rum and keep it warm until ready to use – don’t let it simmer!
In a medium skillet over medium heat, add butter and when it’s melted, add brown sugar and freshly squeezed orange juice. Stir until the ingredients are well blended and bring to a simmer.
When the mixture is simmering, add the banana pieces cut side down and let them sit, undisturbed, for a minute before spooning the sauce over; cook for 2 minutes.
Carefully flip them over and add orange zest; cook for another 2 minutes.
Take the saucepan and ignite the rum. Then pour it over the banana pieces – let the flame subside.
Serve it immediately with a nice big scoop of vanilla ice cream and pour the delicious sauce over.