From Bon Appetit, June 2011
6 oil-packed anchovy fillets, chopped (optional)
1 garlic clove, chopped
1 1/2 tablespoons capers, rinsed and chopped
1 Fresno chile or red jalapeño, stemmed, seeded, minced
4 cups loosely packed fresh flat-leaf parsley leaves, finely chopped
2 cups loosely packed fresh mint leaves, finely chopped
1 cup loosely packed fresh cilantro leaves, finely chopped
1 cup plus 2 tablespoons extra-virgin olive oil
Kosher salt (optional)
Combine anchovies (if using), garlic, capers, and chile in a mortar or food processor. Pound with a pestle or process until a chunky paste forms. Add herbs and stir to combine. Remove pestle or transfer paste to a bowl. Using a fork, slowly whisk in oil to make sauce. Season to taste with salt, if desired. Let stand at room temperature for 30 minutes while flavors meld. DO AHEAD Sauce can be made 1 week ahead. Cover and chill. Bring to room temperature and stir before serving.
Suggestions: Serve on grilled meat, vegetables or fish.
I substituted garlic scapes for the garlic and made the whole thing in the food processor. You can also add other fresh herbs if you have some on hand (savory, tarragon, etc).