Fiskesuppe (Norwegian Cod and Root Vegetable Chowder)

Name: Fiskesuppe (Norwegian Cod and Root Vegetable Chowder)
Cuisine: American, Southern
Ingredients: 6 tbsp. unsalted butter; 4 cloves garlic, chopped; 2 stalks celery, chopped; 1 small onion, chopped; 1 green bell pepper, seeded and chopped; 1 small leek, sliced 1/4" thick; Kosher salt and black pepper, to taste; 2 medium carrots, sliced 1/4" thick; 1 large parsnip, peeled and chopped; 1 small celeriac, peeled and chopped; 4 medium new potatoes, peeled and cut into 1" pieces; 3 cups fish stock; 2 cups milk; 1 cup heavy cream; 1 1⁄2 tbsp. Worcestershire sauce; 2 lb. boneless, skinless cod fillet, cut into 2" pieces; 1⁄3 cup dill, chopped, plus more for garnish; 1⁄4 cup parsley leaves, chopped; Juice of 1 lemon; Crusty bread, for serving