What is the primary purpose of a bar spoon?

The primary purpose of a bar spoon is to mix drinks and layer cocktails. This specialized tool, typically characterized by a long handle and a small, spiral-shaped bowl at the end, allows bartenders to effectively blend ingredients in a glass or shaker, ensuring a well-mixed drink. Its length helps to reach the bottom of tall glasses and cocktail shakers for thorough mixing without disturbing the layers of a layered drink.

While measuring ingredients, serving drinks, and stirring sauces can be related tasks in a bar setting, these functions are not the primary focus of a bar spoon. Measuring typically involves jiggers or measuring cups; serving is done with glasses or pitchers, and stirring sauces is often accomplished with other utensils better suited for food preparation. The design and intended use of the bar spoon firmly establish its role in mixing cocktails and layering drinks, which is why it stands out as the correct answer.