01 - If using fresh clams: Scrub and rinse clams under cold water. In a large pot, add 1 cup water and bring to a boil. Add clams, cover, and steam 5–7 minutes until shells open. Discard any that do not open. Remove clams, reserve liquid, and chop clam meat. Strain liquid and set aside.
02 - In a large Dutch oven or soup pot, melt 2 tbsp butter over medium heat. Add onion, celery, carrots, and potatoes. Sauté 5 minutes until softened. Add garlic and cook 1 minute.
03 - Sprinkle flour over vegetables; stir and cook 2 minutes. Gradually whisk in clam juice, reserved clam steaming liquid, milk, cream, and pickle brine. Add bay leaf, thyme, pepper, and salt (start with ½ tsp; adjust later).
04 - Bring to a simmer, stirring frequently. Cook 12–15 minutes until potatoes are tender.
05 - Add chopped clams, dill pickles, and fresh dill. Simmer 5 more minutes. Taste and adjust seasoning. Remove bay leaf.
06 - Meanwhile, preheat oven to 350°F. In a bowl, mix cracker crumbs with melted butter, dill, and lemon zest. Spread on a baking sheet and bake 5–7 minutes, stirring once, until golden and crisp.
07 - Ladle chowder into bowls. Top each serving with dill cracker crumbs and extra fresh dill.