1/4 c. milk, very cold
1 1/2 c. club soda (approximately), chilled
3 Tbsp. Fox’s U-Bet Chocolate Syrup (or similar, but Fox’s is considered essential for the most authentic flavor)
Pour the milk into a 16 ounce glass. Add club soda until the foam in the glass is about a quarter inch from the top. Then add 3 tablespoons of the chocolate syrup and stir rapidly to combine. Serve immediately.