In a medium saucepan, mix the cocoa powder, sugar, brown sugar, and salt.
¾ cup cocoa powder, ¾ cup sugar, ¾ cup brown sugar, ¼ teaspoon salt
Add the coffee and vanilla and whisk until well combined.
1 cup cold coffee, 1 tablespoon vanilla extract
Place the saucepan over medium heat and bring it to boiling, stirring constantly.
Reduce heat and simmer for about 5 minutes, continuing to stir.
Remove from heat and the semisweet morsels, stirring until they are all melted.
¼ cup semisweet morsels
Allow to cool and serve over ice cream, fruit, etc.
Store leftovers covered in the refrigerator. It will get very thick when cold, but you can microwave it briefly to get a thinner sauce.
Video
Notes
Don't have brewed coffee handy? Go ahead and dissolve a rounded teaspoon of instant into one cup of water. No need to even heat it up!
Note that it takes quite a bit of whisking to get the cocoa powder to incorporate. And even then a lot of it seems to sit on top. Don't worry about it, just keep going, it will eventually all come together.
Drizzle this sauce on fruit, cookies, ice cream and more.
Mix your chocolate syrup into some milk for a delicious chocolate-y beverage. You could also microwave this for hot chocolate.
For added richness, stir in a tablespoon or so of butter.
Add espresso powder if you want to accentuate the coffee flavor.
Using flavored extracts can change the flavor of this sauce. Try mint, orange, or hazelnut to get different variations of this sauce.