In a food processor, pulse the cilantro, almonds, onion, chile, and salt until well blended. With the food processor running, slowly add the olive oil in a steady stream.
Add more oil as needed for your use.
Makes about 1 cup.
Whatever you don't use, you can freeze. Line a ice cube tray with plastic wrap and fill in the individual cube spaces with the pesto. Freeze and remove from the ice tray, put in a sealed freezer bag for future use.
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