Chocolate Syrup

Description

Combine ½ cup sugar and 1 cup water in a medium saucepan and bring to a boil over medium heat, whisking until sugar is dissolved. Whisk in ⅔ cup unsweetened cocoa powder, preferably Dutch-process, and ¼ tsp. kosher salt and simmer, whisking, until slightly thickened, about 3 minutes. Remove from heat and add 1 tsp. vanilla extract, then cool to room temperature (syrup will continue to thicken).