Lovage (Liebstoeckl) has a strong, celery-like flavor with a hint of anise. If unavailable, you can substitute with extra fresh parsley and a pinch of fennel seeds.
Liquamen is an ancient Roman fermented fish sauce. Modern substitutes include fish sauce (like nuoc mam) or a combination of soy sauce and anchovy paste for a similar umami depth.
Salmon is recommended in the original recipe for its ability to hold up well in stewing, but firm white fish like cod or sea bass also work beautifully.
Leftovers can be stored in an airtight container in the refrigerator for up to 2 days. Reheat gently on the stove to prevent the fish from breaking apart.