Step 6
For the topping set a a medium nonstick saucepan over low heat. Add sugar in an even layer and cook over low, undisturbed, until warm, about 2 minutes. Add water, and stir constantly until all the sugar is melted, about 45 seconds. Add butter, stirring constantly until butter is melted and incorporated, about 30 seconds. Increase heat to medium; add heavy cream, rum, cinnamon, and vanilla, and cook, stirring constantly, until well combined and slightly thickened, about 2 minutes. Add pecans, stirring until well coated, and remove from heat. Cool until room temperature and thickened, about 30 minutes.