Wild garlic oxidizes faster than basil: the leaves are sensitive to heat and oxygen. Chill the Vitamix container briefly before blending, or put the wild garlic leaves in the freezer for 5 to 10 minutes — this slows oxidation and keeps the pesto bright green rather than gray-olive. Once blended, transfer it straight into a clean screw-top jar and cover it with a thin layer of olive oil.
The bitterness trap: the same two-stage approach applies to wild garlic pesto. First break the wild garlic, pine nuts, and Parmesan down coarsely at speed 5 to 6 for about 10 to 15 seconds, then stop the blender. Start again at speed 1 and let the olive oil run in slowly through the lid opening — only until the pesto is smooth. To be safe, stir in the last third of the oil with a spoon instead of blending it.
Seasonal tip: wild garlic is only available for a few weeks. To stock up, freeze the finished pesto in portions in ice cube trays — it keeps for up to 3 months. Stirring in fresh Parmesan after thawing gives a better texture than freezing the cheese in.
Why the Vitamix: wild garlic leaves are broad and fibrous and resist the mortar, which rarely produces a truly smooth paste. In the Vitamix they break down completely at speed 5 to 6 before the olive oil runs in at speed 1 as a stable emulsion. The result is creamier and more even than with a food processor or hand blender. If you freeze several jars to stock up, you also benefit from the batch capacity of the 1.4 L container, which works cleanly from about 250 ml.