11 Time-Tested Secrets to Authentic South Indian Filter Coffee

3. Perfect Your Grinding Technique and Consistency

Grinding for the metal filter needs attention. Aim for a grind that is finer than drip coffee but coarser than espresso—think between table salt and fine sand. That gives surface area for steady extraction during the long drip without passing through the filter. A burr grinder is the best tool here because it gives an even grind; set it to a medium-fine setting and do a small test brew. If the decoction drips very slowly or becomes bitter, try slightly coarser; if it drips too fast and tastes weak, go a touch finer. Grind only what you need for a few days; ground coffee loses aroma quickly. Store whole beans or ground coffee in an airtight jar in a cool, dark spot. Avoid the fridge; moisture is the enemy. Keep notes: jot the grinder setting and the result so you hit the same grind every time.