2 1/2 cups sugar 
3 tablespoons cocoa powder 
2 cups whipping cream 
3 tablespoons Karo syrup 
2 teaspoons vanilla 
2 tablespoons salted butter

Mix sugar and cocoa together in a saucepan. Add whipping cream and Karo syrup. Bring to a boil. Reduce heat to medium and cook until mixture begins thickening, about 7 minutes. Remove from heat, and add vanilla and butter. Do not stir. Let sit for 5 minutes, then stir until smooth. Pour over cake, brownies or another dessert of choice.