Psarosoupa (Greek Seafood Soup)

Pour stock into a large stockpot and bring to a boil. Boil swordfish until cooked through and easily flaked with a fork, 5 to 6 minutes. Remove fish from stock, reserving all liquid. Coarsely chop/tear fish.

Heat 2 tablespoons olive oil in a separate pot and heat to medium. Add onion, carrots, and celery. Saute for 5 minutes, then add garlic. Saute for 1 minute more. Pour in reserved stock. Add in anchovies, lemon juice and zest, parsley, 1/2 tablespoon salt, celery leaves, 1 teaspoon pepper, thyme, and bay leaf. Increase heat and bring to a boil, then reduce to medium-low. Let simmer for flavors to marry, about 20 minutes.

Stir in potatoes and rice; let simmer until rice and potatoes are tender, about 20 minutes more, adding swordfish in during the last 5 minutes of cooking time. Season with more salt and pepper to taste.

Ladle soup into bowls and drizzle remaining olive oil over it.