Combine all of the ingredients except the olive oil in a food processor or high-powered blender. Note: if you want to use the white or lighter green part of the scallion, you are welcome to add them in addition to the green parts, but keep in mind that they have a stronger flavor.
Pulse the ingredients until a paste forms. Slowly drizzle the olive oil through the whole in the lid until the pesto reaches your desired consistency. Stop and scrape down the sides of the food processor bowl as needed to promote even blending. You may find that you need a little less or a little more olive oil than the amount listed.
Taste the pesto and adjust seasonings as desired. Serve as a dip, sauce, or spread. Enjoy!
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