What is a paring knife with a curved blade that makes cutting rounded surfaces easier called?

A paring knife with a curved blade designed for cutting rounded surfaces is known as a tourné knife. This type of knife is specifically crafted to perform precise tasks such as peeling, trimming, and shaping fruits and vegetables into a particular form, often achieving a rounded appearance. The curved blade allows the chef to easily navigate the contours of various ingredients without tearing or damaging them, making it a valuable tool in fine culinary presentation and food preparation.

The other options are distinct types of knives that serve different purposes. A chef's knife is a versatile tool used for a wide range of tasks, from chopping to slicing, but it does not have the specialized curved blade needed for intricate work on rounded surfaces. A fillet knife is designed primarily for fish, featuring a flexible blade that aids in removing skin and bones, which is not suitable for the tasks typically performed with a tourné knife. Lastly, a serrated knife has a saw-like edge ideal for cutting through bread or other items with a hard crust or soft interior, but it lacks the precision and curvature of a tourné knife needed for shaping rounded surfaces.