Heat a pan, add coriander seeds, fenugreek seeds. Roast them on a low flame until they turn aromatic. Keep aside and let them cool down.
In the same pan, dry roast the Bengal gram, urad dal on a low flame until they turn aromatic. Keep aside and let them cool down.
Finally, add red chili to the pan and roast them. Make sure all ingredients cool down before adding to the blender.
Add all roasted ingredients, hing in a blender, and grind them into a fine powder.
Notes
Store this homemade sambar powder in an airtight container. This powder stays fresh, aromatic up to 3 months. If refrigerated it stays fresh up to 6 months.
Make sure the lid is closed well, otherwise the powder will lose its aroma and flavor.