Foryoueats: Cajun Shrimp Alfredo

16 ounces uncooked fettuccine pasta

1 pound medium peeled, deveined raw shrimp

2 teaspoons Cajun seasoning

2 tablespoons olive oil

1 cup finely chopped yellow onion (from 1 onion)

1/2 cup finely chopped celery (from 1 stalk)

2 garlic cloves, minced

1/3 cup chicken stock

1 cup heavy cream

4 ounces Parmesan cheese, grated (about 1 cup)

1 teaspoon coarsely ground black pepper

1 teaspoon kosher salt

1/4 teaspoon cayenne pepper

1/3 cup sliced scallions, for garnish

Cajun Shrimp Alfredo