For the Liquamen substitute, you can use fish sauce for a more authentic Roman flavor profile if white wine is not preferred.
If Liebstoeckl (Maggy root) is unavailable, you may omit it or substitute with a small amount of horseradish for a similar pungent kick.
Store leftovers in an airtight container in the refrigerator for up to 3 days. Reheat gently on the stove to prevent the sauce from splitting.