Slow-Cooker Low-Country Shrimp Boil

Ingredients

• 2 cups bottled clam juice
  
• 1 cup water
  
• 1 cup chopped onion
  
• 3 garlic cloves, minced
  
• 2 tablespoons seafood seasoning (such as Old Bay)
  
• 1 pound small red potatoes (1 to 1 1/2–inch diameter), halved
  
• 12 to 16 ounces cooked kielbasa or other link sausage, cut into 2-inch pieces
  
• 4 ears fresh sweet corn, husks and silks removed, halved crosswise
  
• 1 ¹/₂ pounds fresh or frozen jumbo unpeeled shrimp (16/20 count), thawed
  
• 1 lemon, plus more wedges for serving
  
• Melted butter, for serving