Dramatic bananas Foster flambéed in rum, butter, and brown sugar is a legendary New Orleans family dessert experience. This theatrical, caramelized treat is best served warm over vanilla ice cream.
Peel and slice the bananas lengthwise, then halve each for a total of 8 pieces; set aside.
In a large skillet over medium heat, melt the butter until foamy, then stir in the brown sugar, cinnamon, vanilla extract, and a pinch of salt. Cook, stirring, until the sugar is fully dissolved and the mixture bubbles—about 2 minutes.
Gently add the banana pieces cut-side down. Spoon sauce over the bananas and cook for 1-2 minutes, until they begin to soften and the sauce thickens. Do not over-stir to prevent the bananas from breaking.
Pour in the rum carefully. Tilt the pan slightly to ignite, or use a long lighter to flambé the sauce. Let the flames subside naturally, allowing the alcohol to burn off—around 30 seconds.
Spoon the warm bananas and sauce over bowls of vanilla ice cream. Serve immediately while hot for the best contrast of temperatures and flavors.