What ingredient floats on top of the Harvey Wallbanger cocktail?

In a Harvey Wallbanger cocktail, Galliano is the ingredient that floats on top. This Italian herbal liqueur is known for its distinctive flavor and golden color, which make it visually appealing when added last to the drink. The cocktail is typically constructed by mixing vodka and orange juice, and then gently layering Galliano on top. The technique of floating the liqueur not only creates a beautiful presentation but also allows for the unique flavor profile of Galliano to be experienced as the drink is consumed. Its aromatic qualities complement the citrus notes from the orange juice, enhancing the overall taste of the cocktail.