Cajun Crawfish Fried Rice

Name: Cajun Crawfish Fried Rice
Ingredients: 3 tablespoons extra-virgin olive oil; 3 andouille sausages (about 10 ounces), quartered lengthwise and sliced 1/2 inch thick; 2 stalks celery, chopped; 1 onion, chopped; 1 red bell pepper, chopped; 3 cloves garlic, finely chopped; 1 1/4 teaspoons Cajun seasoning; 4 cups cooked white rice, cooled (thawed if frozen); 1 8-ounce package frozen cooked crawfish tail meat, thawed (or 8 ounces cooked peeled small shrimp); Kosher salt; 3 scallions, thinly sliced; Fresh cilantro leaves, for topping