Slice your bananas into small, even coins. Place the butter in your large skillet. Melt it over a medium heat setting.
Add the brown sugar to the melted butter. Stir it until the mixture starts to bubble. This creates a quick caramel base for you.
Slide the banana slices into the bubbling sugar. Sprinkle the cinnamon and salt over the fruit. Cook them for about three minutes until soft.
Pour the dark rum into the skillet carefully. Let it simmer for two more minutes. This removes the sharp alcohol taste from the sauce.
Remove the pan from the heat now. Let the banana mixture cool down completely. You do not want to melt your cream.
Whisk the heavy cream and milk in a bowl. Stir in the vanilla extract and extra sugar. Make sure everything is well blended and smooth.
Pour the cream mixture into your ice cream maker. Turn the machine on to start the churning. Let it run for about twenty minutes.
Add the cooled banana sauce during the last minutes. Let the machine swirl the fruit into the cream. Do not over-mix the beautiful brown ripples.
Spoon the soft ice cream into your storage container. Smooth the top with your rubber spatula quickly. Cover it tightly to prevent ice crystals.
Place the container in the back of the freezer. Let it firm up for at least four hours. Now your delicious homemade treat is ready.