What does a barista primarily work with in a café?

A barista primarily works with espresso machines and coffee grinders as these are essential tools for preparing coffee-based drinks. Their primary role centers around the preparation of espresso, which involves using an espresso machine to extract the concentrated coffee beverage. Additionally, baristas grind coffee beans to ensure that the coffee is freshly ground for each brew, which significantly impacts the flavor and quality of the coffee served.

While ovens and baking supplies are more associated with pastry chefs or bakers, and entertainment systems may be relevant in certain café environments, they are not part of the barista's core responsibilities. Cleaning supplies, while necessary for maintaining a clean workspace, do not encapsulate the primary function of a barista. Thus, working with espresso machines and coffee grinders captures the main focus of a barista's role in delivering high-quality coffee to customers.