Use high-quality anchovy fillets packed in oil for best flavor. Freshly grated Parmesan cheese is recommended for creamier texture. For a thinner dressing, add water or extra lemon juice. Let the dressing sit refrigerated for at least 30 minutes before serving to meld flavors. Variations include using Greek yogurt for a lighter version, adding cayenne pepper for spice, or making a vegan version with vegan mayonnaise and capers.