Grandma Flo's Cocoa Syrup

In a small saucepan bring the cocoa, sugar, water, salt and corn syrup to a rolling boil over medium-high heat, stirring constantly. Reduce heat to medium-low and cook for 3 minutes without stirring.

Remove from heat and add vanilla, stirring to mix well.

Cool to room temperature and then store in a tightly covered container in the refrigerator until ready to use. Keeps well for months.