Heat a cast-iron skillet over direct heat. Melt the butter until it begins to brown, then stir in the sugar and cinnamon until the sugar melts. Stir in the salt. Add the bananas in an even layer and cook, turning the bananas once to coat in the sauce, until lightly browned, 1 to 2 minutes per side.
Remove the skillet from the heat and add the rum. Light the sauce with a lighter and allow it to flame. Once the flames have extinguished, baste the bananas with the sauce. Add the orange zest. Serve warm over vanilla ice cream.
(Alternatively, you can cook the bananas over medium-high heat on a stovetop.)
Use extreme caution when igniting alcohol. Remove the pan from the heat source before adding the alcohol. Pour the alcohol into the pan and carefully ignite with a match or click lighter. Return the pan to the heat and gently swirl to reduce the flames.
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