Ingredients

3/4 cup unsweetened Dutch-process cocoa powder, sifted 

2 cups sugar 

1/4 teaspoon coarse salt 

6 ounces bittersweet chocolate, preferably 61 percent cacao, chopped 

1 3/4 teaspoons pure vanilla extract 

Preparation

Bring cocoa powder and 2 cups water to a boil in a medium saucepan over medium heat, stirring constantly. Reduce heat to medium-low. Stir in sugar and salt until dissolved. Simmer, stirring occasionally, 3 minutes. Remove from heat. Add chocolate; stir until it has melted. Pour through a fine sieve into a large bowl; discard solids. Stir in vanilla. Let cool 2 hours, stirring occasionally. Serve warm, room temperature, or cold.