Coarsely chop peppers, radishes, garlic, onions, tomatoes and cilantro in a food processor or with a chef's knife.
Transfer to a bowl, then add salt, tomato paste and water. Mix it up well.
Use right away or store refreigerated up to 10 days.
I used roasted Anaheim peppers instead of Serano, and it was very good, but guess it took away some of the "freshness." Serano peppers aren't always easy to find in this part of the country.Servings: 2 to 3 cups