Cook leeks and carrots in butter till soft, about 10 min on medium heat.
Add garlic and cook until fragrant, about 1 minute.
Add bay and white wine. Cook till little to no liquid remains.
Add stock, clam juice, and fish sauce and bring to a boil.
Reduce heat to a simmer and add celery root. Cook at a simmer for 15 min, or until celery root is tender.
Turn off heat and add salmon. Let stand covered for 15 min to gently cook through in the residual heat.
Stir in cream, lemon, and dill.
Add salt and pepper to taste and serve.
