Traditional Miris Gala stone mortar grinding: crushing chili seeds for authentic Pol Sambol?

Authentic Sri Lankan Pol Sambol requires a traditional two-piece granite grinding stone (Miris Gala: a flat lower slab and a heavy cylindrical rolling pin / Ambarana Gala). Grinding dried red chilies, sea salt, and shallots under the rolling stone generates high compressive shearing forces that rupture whole chili seed coats, releasing volatile capsaicin oils and natural aromatic terpenes. Electric blenders chop ingredients with high-speed steel blades, aerating the mixture with oxygen and creating a pale, frothy puree; stone grinding compresses cell walls without oxidation, producing a rich, coarse, deep-crimson paste that binds freshly scraped coconut flakes.