Scallop and Shrimp Cocktail

Kosher salt

1/2 pound jumbo sea scallops (6 to 8)

1/3 cup finely chopped red onion

1/4 cup clam-tomato juice (such as Clamato)

1/4 cup ketchup

1/4 cup fresh lime juice

3 tablespoons chopped fresh cilantro

1 teaspoon seeded and finely chopped serrano chile pepper 1 teaspoon hot sauce

Freshly ground pepper

1/2 pound cooked small shrimp, peeled and deveined

Saltines or tortilla chips, for serving