What essential tool, along with a pastry bag, does a cake decorator utilize most frequently?

An offset spatula is an essential tool for cake decorators because it provides a unique advantage when spreading and smoothing frosting or other toppings on a cake. The offset design allows for better control, enabling decorators to work with precision while keeping their hands away from the surface of the cake. This is particularly important for achieving smooth finishes and even layers.

The spatula can also be used to lift and place delicate decorations without disturbing their structure, making it a versatile tool in a decorator's kit. Its flexible blade allows for a gentle touch, which is crucial when working on intricate designs or delicate pastry elements.

While other tools like the bench scraper, pastry wheel, and paper cone serve their respective purposes in decorating and preparing pastries, the offset spatula stands out for its direct application in frosting and finishing cakes, making it indispensable in the day-to-day tasks of a cake decorator.