What does the technique "tourner" involve?

The technique "tourner" specifically refers to shaping vegetables into a barrel or football shape, which is characterized by a tapered and rounded appearance. This traditional French culinary technique not only enhances the visual appeal of the dish but also ensures even cooking and uniform presentation. The act of turning or shaping the vegetables through this method typically involves using a paring knife to carefully carve and refine their surfaces, creating a polished look.

In contrast to the other options, such as cutting vegetables into uniform pieces, cooking them over high heat, or boiling them for flavor, "tourner" is solely focused on the aesthetic and structural transformation of vegetables. While uniform cutting deals with creating evenly sized pieces for consistent cooking, it does not involve the shaping that "tourner" accomplishes. Similarly, the cooking methods listed do not relate to the specific culinary artistry of shaping vegetables, which is central to the "tourner" technique.