Trim bulb end and opposite tough end from garlic scapes, then slice into 2" to 3" sections. Weigh out ½ lb, then add to the bowl of a food processor or a blender.
Add shelled pistachios, cubed cheese, lemon zest and juice, basil leaves, salt, and cracked black pepper. Process ingredients until combined, then drizzle olive oil in a steady stream from the top shoot. Scrape the sides, as needed.
Taste the pesto and see if the seasonings need to be adjusted. Once satisfied with the flavor, store in mason jars and refrigerate or freeze for later use.
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Notes
Harvest garlic scapes when they're young and tender. Older, more fibrous garlic scapes can affect the texture and flavor of the pesto.
Toast the nuts before adding them to add depth of flavor.
To make this garlic scape pesto recipe vegan, substitute nutritional yeast for the cheese.
Use an ice cube tray to freeze pesto in small portions. Once frozen, transfer to a freezer bag for easy access all year!
Store leftovers in an airtight container in the fridge for up to a week.
Top with a thin layer of olive oil to prevent browning or oxidation.