What might a guest expect to receive on the side when ordering a pasta dish?

When a guest orders a pasta dish, it's common for them to expect grated Parmesan cheese on the side. This is because Parmesan is a classic accompaniment that enhances the flavor of many pasta dishes, allowing guests to personalize their meal to their taste. It is a standard practice in many Italian and Italian-American restaurants to provide this option, as it adds richness and umami to the dish.

While the other options can also complement pasta, they are not as universally expected. Olive oil, for example, might be offered depending on the dish or as part of a dipping sauce, but it is not a standard side. Red pepper flakes can be provided for those who like additional heat, yet they are typically presented upon request or as table condiments rather than a common side. Garlic bread, while often served with certain pasta dishes, is not a default side and varies based on the specific menu item chosen. Thus, Parmesan cheese stands out as the most likely and traditional accompaniment when ordering pasta.