Brimming with seafood, this easy pasta has one big time-saving, store-bought secret.

Victor Protasio

This shellfish spaghetti recipe is abundant with a medley of seafood.

The sauce is finished with a couple of tablespoons of butter which helps it cling to the spaghetti perfectly.

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Photo:Victor Protasio

Clams can be very sandy and gritty.

Cook spaghetti according to package directions.

Drain spaghetti and return it to pot.

Meanwhile, bring wine to a simmer in a large pot.

Add clams, mussels, and shrimp, in that order.

(Remove shrimp if it is cooked through before clams and mussels open.)

Transfer shrimp to a medium bowl.

Transfer clams and mussels to a large bowl.

Remove about half of mussels and clams from their shells and set aside.

If cooking liquid looks gritty, pour it into a liquid measuring cup; let stand for 2 minutes.

Slowly pour liquid back into pot, leaving about 2 tablespoons liquid and solids behind.

Stir marinara sauce into cooking liquid in pot.

Bring to a simmer over medium; cook, stirring occasionally, until slightly thickened, about 5 minutes.

Remove from heat and stir in butter.

Add cooked spaghetti, shrimp, and shelled clams and mussels to the sauce; toss to coat.

Add clams and mussels in their shells and toss gently.

Serve immediately, topped with parsley and (if desired) crushed red pepper.