Place butter, sugar, cinnamon, nutmeg, allspice, and vanilla extract in the bottom of an Irish coffee glass. Pour in rum and hot water. Stir.
I’ve never used the optional spices, and Ihave always used light rum. I also don’t exactly measure my butter or brown sugar. I just place the dollop of butter in the mug along with the teaspoon of brown sugar. It’s definitely a drink to warm you up.
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