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Rinse and roughly chop the wild garlic leaves.
Blitz the wild garlic leaves, parmesan, garlic, lemon zest and pine nuts to a rough paste in a food processor. Season, and with the motor running slowly, add almost all the oil. Taste, season and add a few squeezes of lemon juice.
Transfer the pesto to a clean jar and top with the remaining oil. Will keep in the fridge for two weeks.