This dressing is based on the classic French sauce called gribiche, and can accompany vegetables as it does here, but is also pretty terrific spooned over crispy-skinned fish or roasted salmon. Use medium- or thick-stalked asparagus for heft — pencil-thin asparagus would get upstaged.
Method:
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Peel and mince shallot; transfer to a medium bowl and season with salt.
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Juice lemon into a small liquid measuring cup. Add enough vinegar to measure 80 ml in total. Pour lemon-vinegar mixture over shallot. Set aside while you prep the remaining ingredients.
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Thinly slice the cornichons into rounds and place in a small bowl. Smash and pit the olives, then tear into small pieces; add to the bowl. Pluck the parsley leaves with some tender stem attached, then gather them up on your cutting board and thinly slice into ribbons (save the remaining parsley stems for making stock). Set cornichon-olive mixture and parsley aside separately.