Gather all your ingredients and equipment before beginning to ensure a smooth process.
In a heavy-bottomed saucepan, melt the butter over medium heat, watching as it bubbles gently and releases a rich aroma.
Add the ground spices—cinnamon, nutmeg, and clove—and toast them for about 30 seconds until fragrant, stirring constantly to prevent burning.
Pour in the dark rum and apple cider, then stir well to combine all the flavors and create a warm, fragrant mixture.
Bring the mixture to a gentle simmer and let it cook for about 5 minutes, allowing the flavors to meld and the butter to emulsify into the liquid.
Stir in honey or maple syrup to taste, tasting the mixture and adjusting sweetness as desired.
Remove the saucepan from heat and pour the hot buttered rum into mugs or heatproof glasses.
Garnish each mug with a twist of citrus zest or a cinnamon stick for a decorative and aromatic finishing touch.
Serve immediately while hot, enjoying the creamy, spiced aroma and cozy warmth with each sip.