Grind onions, garlic, cilantro, parsley, cumin seeds, coriander seeds, peppercorns, red chile powder, and salt in a food processor, scraping down the sides as necessary until the mixture is finely ground. Transfer this to the same bowl. (If you have a large food processor, you can blend everything together.)
1 Onion, 5 cloves Garlic, ½ cup Cilantro, 1 ½ cups Parsley, ¼ teaspoon Cumin seeds, ½ teaspoon Coriander seeds, 5 Black peppercorns, ½ teaspoon Red chile powder, 1 ½ teaspoon Salt