Dark Chocolate Fudge Sauce 

https://www.americastestkitchen.com/recipes/11053-dark-chocolate-fudge-sauce

SERVES Makes 2 Cups 

1 1⁄4 cups (8 3/4 ounces) sugar 

2⁄3 cup whole or 2 percent low-fat milk 

1⁄4 teaspoon salt 

1⁄3 cup (1 ounce) unsweetened cocoa powder, sifted 

3 ounces unsweetened chocolate, chopped fine 

4 tablespoons unsalted butter, cut into 8 pieces and chilled

1 teaspoon vanilla extract

INSTRUCTIONS 

1 Heat sugar, milk, and salt in medium saucepan over medium-low heat, whisking gently, until sugar has dissolved and liquid starts to bubble around edges of saucepan, 5 to 6 minutes. Reduce heat to low, add cocoa, and whisk until smooth. 

2   Remove saucepan from heat, stir in chocolate, and let stand for 3 minutes. Whisk sauce until smooth and chocolate is fully melted. Add butter and whisk until fully incorporated and sauce thickens slightly. Whisk in vanilla and serve. (Sauce can be refrigerated for up to 1 month. Gently reheat sauce in microwave [do not let it exceed 110 degrees], stirring every 10 seconds, until just warmed and pourable.)