1 oz Coconut Cartel Añejo Rum  
3 oz Hot Water  
.5 oz Condensed Milk  
.25 oz Ancho Reyes  
.25 oz Salted Brown Sugar Syrup*  
1 Tbsp Unsweetened Cocoa Powder

In a mug, combine cocoa powder, condensed milk, salted brown sugar syrup and hot water. Mix until cocoa is completely dissolved. Add rum and Ancho Reyes and gently stir. Garnish with a marshmallow.

Recipe for Salted Brown Sugar Syrup: 
1 cup Brown Sugar 
1 cup Water 
Pinch of Salt

Over low heat, combine sugar, water and a pinch of salt until evenly dissolved.