Smoky Seafood Cocktails

Name: Smoky Seafood Cocktails
Ingredients: 4 garlic cloves, smashed; 1 tablespoon coriander seeds; 1 tablespoon fennel seeds; 1/2 teaspoon crushed red pepper; 1 tablespoon kosher salt; 8 cups water; 1 lemon, plus 2 tablespoons fresh lemon juice; 1 3/4 pounds shelled and deveined large shrimp; 1 1/2 pounds jumbo sea scallops, halved horizontally; 1 cup bottled chile sauce; 1 tablespoon prepared horseradish; 1 1/2 teaspoons hot pimentón de la Vera (smoked paprika); 24 stone crab claws, cracked and chilled (see Note)