Slow-Cooker San Francisco Cioppino with Toasted Sourdough

This slow-cooker Cioppino brings the flavor of San Francisco's fisherman's wharf straight to your kitchen. Crab claws, clams, mussels, and calamari simmer gently in a rich tomato-fennel broth with white wine, creating a deeply savory seafood stew.

The hands-off method lets the shellfish open naturally while you go about your day. Serve it with garlic-rubbed toasted sourdough for a meal that feels both rustic and special.

Cioppino is a classic Italian-American seafood stew born in San Francisco, where fishermen would toss whatever the day's catch brought into a pot with tomatoes, wine, and herbs. This slow-cooker version simplifies the process without sacrificing depth of flavor.

The slow cooker gently coaxes the fennel and garlic into the tomato base while the shellfish steam open in the fragrant liquid. The result is a brothy, briny, and comforting stew that's perfect for a cozy dinner. Serve it with crusty bread to soak up every last drop.

Ingredients

Why this recipe works

The slow cooker provides a gentle, even heat that allows the tomato-fennel broth to develop complexity over four hours.

The low temperature extracts flavor from the fennel and garlic without scorching, while the wine's acidity brightens the tomatoes. The shellfish cook in the steam and broth, opening naturally and releasing their briny juices into the stew.

This method is forgiving and hands-off. Unlike stovetop versions that require constant attention, the slow cooker does the work. The broth becomes richer as the shellfish release their liquid, and the calamari added at the end stays tender. The result is a restaurant-quality cioppino with minimal effort.

Notes and substitutions

Choose the freshest shellfish you can find. Clams and mussels should be tightly closed or close when tapped. Scrub them well and debeard the mussels.

Dungeness crab claws are traditional, but king crab legs or even lump crab meat added at the end work well. Calamari rings cook quickly, so add them only during the last few minutes.

Use a dry white wine like Sauvignon Blanc or Pinot Grigio. If you prefer not to use wine, substitute seafood stock or chicken broth with a squeeze of lemon. The fennel bulb is essential for the characteristic flavor—do not skip it. Serve with a sturdy sourdough that can stand up to the broth.

• Dungeness crab claws: Use king crab legs or jumbo lump crab meat added during the last 15 minutes.
• Littleneck clams: Substitute Manila clams or increase mussels by 1/2 pound.
• Dry white wine: Use seafood stock or chicken broth plus 1 tablespoon lemon juice for acidity.
• Calamari rings: Replace with 1/2 pound peeled and deveined shrimp added in the last 15 minutes.

Equipment

• Slow cooker (6-quart or larger)
• Cutting board
• Chef's knife
• Measuring cups
• Wooden spoon
• Toaster or broiler