The working principle of a coarse pepper grinder is fairly straightforward. It typically consists of a container or hopper where the whole peppercorns are placed, and a grinding mechanism that grinds the peppercorns to the desired coarseness.

When you turn the grinder's handle or press a button, it activates the grinding mechanism, which can vary depending on the type of grinder. Some grinders use a burr mechanism, where two metal plates with sharp edges rotate against each other to crush the peppercorns. Other grinders may use a blade mechanism, similar to a blender, where a blade spins rapidly to chop the peppercorns.

As the peppercorns are fed into the grinding mechanism, they are crushed or chopped to the desired coarse size. The ground pepper then falls into a collection chamber or directly onto your food. Many grinders have an adjustable coarseness setting, allowing to control how fine or coarse you want  pepper to be.

The coarse pepper grinder works by breaking down whole peppercorns into smaller particles, giving you the ability to season food with freshly ground pepper.