Coimbra recipe pickled walnuts contain hand-picked whole green walnuts, apple cider vinegar, malt vinegar, red wine vinegar or white wine vinegar, basil, garlic, black peppercorns, cloves, mustard seed, celery seed,
allspice, mace,
bay leaf (used in brining process),
and salt (residue from brining process). The apple cider vinegar recipe also contains nutmeg.