Milk, Seltzer and Chocolate syrup. * 1/2- 1 cup cold whole milk in a glass, add seltzer (high pressure is better) until it's foamy and the glass is almost full, gently stir in 2 T good chocolate syrup. You don't want to lose the head. *
Syrup first if you want the sight of chocolate on the bottom of the glass...if you don't...it's milk first and then syrup....this is how I was taught when i was a soda jerk at the Lido Beach Hotel on L.I. years ago......it's your choice!
Milk...THEN chocolate...it dissolves better...then the seltzer stirring as you pour it in to create a nice foamy head....that's how I was taught in Brooklyn! PS look for Fox's UBET chocolate syrup for that New York taste!