In 1 quart saucepan, mix sugar with cocoa and cinnamon until fairly lump free.
Stir in water and cook over medium heat , stirring often , until syrup comes to a boil.
Remove from heat, stir in vanilla, cool to room temperature.
Pour into glass pint jar, cover with lid and refrigerate up to 4 weeks.
Makes about 2 cups , enough for 8 servings
Notes
FROZEN HOT CHOCOLATE : Pour 1/4 cup heavy cream and 1/4 cup chocolate syrup into blender. Add 1 cup crushed ice, cover and blend on high until smooth and slushy, pulsing motor to move mixture through blades. Spoon into a chilled glass. Makes 1 serving. HOT COCCOA: Heat 1/4 cup syrup with 2/3 cups milk in saucepan over low heat or heat in mug in microwave. Makes 1 cup.