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Heat a large skillet over high heat and add butter to melt. Once melted, add the brown sugar, cinnamon and salt. Bring to a bubble then add the pineapple and cook for a minute or two. Flip to cook the other side.
Pour rum into a measuring glass. When the pineapple is cooked and golden brown, add the rum in the middle of the pan. Stand back from the pan and tip it towards the flame to flambé. Let the flame die down a bit without moving the pan then remove from heat.