Fat-washing is a growing mixology trend that involves infusing fat into alcohol for a richer flavor, and Nutella-infused rum is the fat wash your home bar is missing.
Once it's sufficiently infused according to your tastes, run the liquid through a cheesecloth to remove any lingering particles and oiliness. Repeat as necessary.
When your rum is clear and clean, store it in a bottle and serve it straight up to fully taste the infused flavors, or add it to cocktails for a sweet, chocolatey finish.