1 1/2 c. water
3 c. sugar
1 1/2 c. powdered cocoa
1 tbsp. vanilla extract
1/4 tsp. kosher salt
2 tbsp. light corn syrup

In small pot, bring sugar and water to a boil. Whisk in cocoa, vanilla, salt and corn syrup. Continue whisking until all of the solids have dissolved. Reduce sauce until slightly thickened. Strain. Cool to room temperature. Pour into squeeze bottles. Squeeze into cold milk or over ice cream.