Fill a small pot partly with water and boil. Keep a dish of cold water near the stove. Prepare a food processor with the blade attachment or a blender.
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Place basil leaves in boiling water and blanch for 5–10 seconds until wilted. Transfer basil leaves to ice water with tongs. This halts cooking.
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Wrap basil with paper towels. Squeeze off all the water and add garlic, pine nuts, and lemon juice to the food processor.
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Pulse until everything is chopped. Pour extra virgin olive oil carefully into the processor on low speed. Basil pesto should have texture, so don't process it too long.
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If your pesto is too thick or lumpy, add additional extra virgin olive oil.See “Notes” for storage advice. Use immediately or store later.
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