Chef John'S Chocolate Egg Cream - cooking recipe

Ingredients

1 ounce chocolate syrup
1 ounce cold milk
8 ounces chilled seltzer water

Preparation

Pour chocolate syrup into a large glass. Pour milk on top of chocolate syrup; stir until completely incorporated and smooth, about 30 seconds.
Slowly pour seltzer water into chocolate mixture, stirring constantly. Mixture will foam and bubble. Serve immediately.