Chocolate syrup

Ingredients (~700 ml):

• 2 cups (400 g) brown sugar
• 1 1/3 cup (330 ml) water
• 1 1/3 cup (130 g) cocoa powder
• 1 tsp vanilla extract

Algorithm:

1. Combine the sugar and water in a saucepan, bring to simmer.
2. Whisk in cocoa powder.
3. Remove from heat and add vanilla extract. Let cool. 

To make chocolate milk, combine with milk.

Source: Food Network