Step 1

Make the gremolata: Place chopped parsley, orange zest, olives, garlic, salt and red pepper flakes (if using) in a food processor and pulse a few times to combine. Scrape down the sides of the food processor and add olive oil. Process until a uniformly chunky texture is achieved.

Step 2

Let the gremolata rest: Allow gremolata to sit at room temperature while you prepare the cioppino, to allow the flavors to fully bloom.

Step 3

Steam the shellfish: Prepare a stockpot with a steamer basket insert large enough to hold the clams and mussels. Bring 2 cups of water to boil in the stockpot, reduce heat to a simmer and steam mussels and clams under a lid until they just open, 5-8 minutes. Remove pot from heat and place all opened mussels and clams in a large bowl. Discard any mussels or clams that don’t open. Reserve 1 cup of steaming liquid.

Step 4

Saute the aromatics: In a large dutch oven or 8-quart stockpot, heat olive oil over medium until the surface just begins to shimmer. Add chopped onion, fennel and a hearty pinch of salt and saute until onion is softened and translucent, about 8-10 minutes. Add minced garlic, roasted red peppers, dried oregano and dried thyme. Saute until garlic is very fragrant and most of the liquid from the vegetables has evaporated.

Step 5

Deglaze the pot: When the red pepper mixture begins to look dry and sticky, add white wine. Use a wooden spoon to scrape up any vegetable bits clinging to the bottom of the pot. Bring mixture to a boil and simmer for 5 minutes.

Step 6

Finish the soup base: Crush whole tomatoes roughly in your hands and add them to the white wine mixture along with any collected juices in the can, seafood stock and 1 cup of reserved steaming liquid. Allow mixture to simmer for 20 minutes uncovered. Taste and add salt as needed.

Step 7

Cook the fish and shrimp: Add whitefish and shrimp to the pot and bring to a simmer. Cover the pot and cook for 2-3 minutes, or until the fish is opaque and shrimp are curled and pink.

Step 8

Finish the soup: Remove pot from heat and stir in mussels and clams. Taste and add salt as needed. Serve immediately, topped with a big spoonful of the parsley-olive gremolata.