Place the butter into a heatproof coffee glass.
Add the maple syrup, allspice and rum.
Top up the glass with warmed apple juice and mix with a spoon until the butter has melted and emulsified in the liquid (like mixing a salad dressing).
Using a lighter or gas hob, lightly warm the cinnamon stick (be careful not to burn it). Add the cinnamon stick as a stirrer and garnish with fresh grated nutmeg.
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