- 1 cup (2 sticks) unsalted butter
- 1 cup (packed) dark brown sugar
- 1 teaspoon ground cinnamon
- 1/4 teaspoon salt
- 1/4 cup dark rum
- 1 tablespoon vanilla extract
- Melt unsalted butter in heavy medium saucepan over medium-low heat. Add dark brown sugar, ground cinnamon, and salt and whisk until sugar is dissolved and mixture is bubbling and smooth, about 6 minutes. Remove from heat. Whisk in dark rum and vanilla extract. Serve warm.
- (Cinnamon-Rum Sauce can be prepared 2 days ahead. Cover and refrigerate. Rewarm over low heat, whisking occasionally, before serving.)