Sauteed Plantains in Caramel Sauce
In a large skillet, melt the butter and cook the plantain slices until golden brown on both sides, 3 to 4 minutes. Transfer to a plate and cover to keep warm.
Add the sugar and cinnamon to the skillet and cook, stirring, until the sugar is melted and bubbly, 1 to 2 minutes. Add the rum, stir to combine, and cook until the sauce is thick and smooth, 2 to 3 minutes.
Serve the plantains in small bowls with the hot sauce drizzled over all. Garnish with the toasted walnuts and serve with vanilla ice cream, if desired.