Why does pepper melt salt?

Pepper doesn't actually melt salt; rather, it contains compounds that can dissolve salt when they interact with moisture. When pepper is added to salt, the moisture in the environment can cause the salt to dissolve slightly, creating a brine that enhances the flavor. Additionally, the aromatic compounds in pepper can enhance the perception of saltiness on the palate, making it seem like the two ingredients interact more dynamically than they actually do.