Trim, seed, and coarsely chop 1 pound jalapeño or serrano chiles. In the bowl of a food processor, combine the chiles with 1 cup each chopped Italian parsley and cilantroincluding the tender stems, 2 tablespoon coarsely chopped garlic, 2 teaspoons salt, 1 teaspoon ground cumin, and 1/2 teaspoon ground black pepper.
Process to form a rough,chunky paste. Pour in 1/4 cup extra virgin olive oil and process again briefly. Pack into a glass jar, cover the top with olive oil, and store in the refrigerator up to 3 months.