Spoon Sunday Night Chocolate Premium Dessert Sauce into a small microwave-safe bowl. Heat in the microwave oven for 10 seconds. Drizzle ½ teaspoon of the sauce into a martini glass in a lacy pattern. Set aside.
Whisk cream and rum into the remaining chocolate sauce until thoroughly combined. Pour into a cocktail shaker. Add ice and shake for 30 seconds. Strain into the prepared martini glass.