Prepare the Mug: Preheat your mug by filling it with hot water, then discard the water to ensure your drink stays warm.
Mix the Butter Mixture: In a small bowl, combine the softened butter, brown sugar, ground cinnamon, ground nutmeg, ground cloves, and a pinch of ground ginger. Mix until it forms a consistent paste. Adjust the sugar and spices according to your taste.
Combine in Mug: Add the spiced butter mixture to the bottom of your preheated mug.
Add Rum: Pour the 2 ounces of spiced rum over the butter mixture.
Add Hot Water: Slowly pour 1 cup of hot water into the mug, stirring constantly until the butter mixture is fully melted and combined with the rum.
Garnish and Serve: Twist the orange peel over the mug to release its oils, then drop it into the drink. Add a cinnamon stick for garnish. Stir gently before serving.
Enjoy: Savor the warm, spiced flavors of your homemade hot buttered rum.