STIR first 4 ingredients with ice and strain into ice-filled glass. FLOAT Galliano on the surface.
Like the Screwdriver, the Harvey Wallbanger has sadly waned in popularity, probably due to it being served with packaged orange juice. When made with freshly squeezed orange juice and Galliano L'Autentico (rather than Galliano Vanilla) this cocktail is worthy of a renaissance.
This drink is traditionally made without the sugar syrup or bitters, but is a better drink with them. Shaking (rather than stirring) the first 4 ingredients makes the drink too thin.