Hot fudge sauce

Active: 5 minutes; Total: 10 minutes; Yield: 3 cups 

Cream, heavy	2 cups
Butter, unsalted	4 tablespoons
Sugar, light brown	½ cup
Sugar, granulated	¾ cup
Salt, fine sea	¼ teaspoon
Chocolate, bittersweet, broken into small pieces	2 ounces
Dutch cocoa, sifted	1 ¼ cups
Vanilla extract	½ teaspoon

1. In a medium saucepan, combine the cream, butter, sugars, and salt. 
2. Bring to a simmer over medium-low heat; simmering for 45 seconds. 
3. Add the chocolate, and whisk to dissolve. 
4. Remove from heat, add the cocoa, and whisk until no lumps remain. 
5. Return the pan to low heat, and simmer the sauce until glossy, whisking constantly, about 20 seconds. 
6. Remove from heat, and stir in the vanilla. 
7. Serve warm. 

Recipe from NYCooking.com.