Slow Cooker Cajun Seafood Boil with Andouille Step-by-step instructions

Before you start

Before starting, ensure the sea scallops are dry-packed and the shrimp are peeled and deveined. If using frozen seafood, thaw it completely in the refrigerator overnight. Slice the andouille sausage into coins about 1/4-inch thick, and halve the baby potatoes (or quarter if larger).

Mince the garlic and measure all the spices. Have the butter melting while you layer the ingredients. The slow cooker should be clean and ready. This prep takes about 15 minutes, and then the slow cooker does the work.

Instructions

Layer and Sauce

1. 1Layer the Seafood and Vegetables
   Place the sea scallops and shrimp in the bottom of a 6-quart slow cooker. Scatter the sliced andouille sausage coins and halved baby potatoes over the seafood, spreading them evenly.
   Look for The slow cooker should be about half full, with ingredients evenly distributed.
   Tip Pat the scallops dry before adding to help them sear later, if browning is desired.
2. 2Make the Cajun Butter Sauce
   In a small saucepan over medium heat, melt the butter. Stir in the garlic, smoked paprika, cayenne, and kosher salt. Cook for 1 minute until fragrant, then remove from heat and stir in the lemon juice.
   Look for The butter is melted and the spices are fragrant, with a deep red color.
   Tip If the butter starts to brown, reduce the heat.

At the end of this phase, the slow cooker contains a colorful layering of seafood, sausage, and potatoes. The butter sauce has been poured over, coating everything in a glossy, reddish-orange sheen. The aroma is already inviting, with hints of garlic and smoked paprika.

The ingredients are not yet cooked, but the sauce is evenly distributed. Before moving to the next phase, make sure the sauce has reached all the nooks and crannies, and that the potatoes are submerged as much as possible.

Slow Cook

3. 3Pour Sauce Over and Cook
   Pour the Cajun butter sauce evenly over the ingredients in the slow cooker. Cover and cook on low for 3 hours, or until the potatoes are tender and the seafood is opaque and cooked through.
   Look for The sauce is bubbling gently around the edges, and the aroma is spicy and buttery.
   Safe temperature 145°F (63°C) internal temperature (shellfish)
   Tip Resist lifting the lid during cooking to keep the heat steady.
4. 4Check for Doneness
   After 3 hours, check that the shrimp are pink and curled, the scallops are opaque and firm to the touch, and the potatoes are easily pierced with a fork. The internal temperature of the seafood should reach 145°F (63°C).
   Look for The shrimp are pink, scallops are milky white, and potatoes yield to a fork.
   Safe temperature 145°F (63°C) internal temperature (shellfish)
   Tip If the potatoes are still hard, cook for an additional 30 minutes and check again.

After 3 hours, the slow cooker is bubbling gently around the edges. The sauce has reduced slightly and thickened, clinging to the seafood and potatoes. The shrimp are pink and curled, the scallops are opaque, and the potatoes are fork-tender. The whole kitchen smells of spicy, buttery goodness. The seafood should be cooked through but still moist. This is the moment to taste a bit of the sauce and adjust seasoning if needed.

Serve

5. 5Serve the Boil
   Using a slotted spoon, transfer the seafood, sausage, and potatoes to a serving platter or individual bowls. Spoon some of the butter sauce over the top. Serve hot with steamed rice and lemon wedges, if desired.
   Look for The dish is piled high, glistening with butter sauce.
   Tip For a more rustic presentation, serve directly from the slow cooker.

The dish is now ready to serve. Using a slotted spoon, you lift out the seafood, sausage, and potatoes, leaving the sauce behind. The pieces are glistening with butter and spices. The texture is tender, and the flavors are fully melded. Serve immediately over steamed rice, with extra sauce spooned over the top. The presentation is rustic and inviting, perfect for a family dinner or a casual get-together.

Common mistakes

One common mistake is overcooking the seafood, which makes it tough and chewy. Because the slow cooker heats gently, it’s easy to leave it too long; check at the 3-hour mark. Another mistake is using wet-packed scallops, which release excess liquid and dilute the sauce.

Always pat seafood dry before adding. Also, don't lift the lid during cooking—this releases heat and extends cooking time. Finally, if you add too much cayenne, the dish can become overwhelmingly spicy; start with less and adjust at the end.

How to tell it’s done

The dish is done when the shrimp are pink and opaque, the scallops are firm and milky white, and the potatoes are easily pierced with a fork. The internal temperature of the seafood should reach 145°F (63°C) on an instant-read thermometer.

The sauce should be bubbling gently and have thickened slightly. If the potatoes are still hard after 3 hours, continue cooking in 30-minute increments until tender. Be careful not to overcook the seafood, as it can become rubbery.

• Shellfish: 145°F (63°C) in the thickest part