Step 1

Bring a large pot of salted water to a boil.

Step 2

Whisk the mayonnaise, Parmesan, sour cream, lemon juice, Worcestershire, garlic, 1/2 teaspoon salt and a few grinds of pepper together in a large bowl.

Step 3

Add the pasta to the boiling water and cook according to the package directions. Drain and rinse under cold water to cool. Transfer to a large bowl along with the dressing.

Step 4

Heat the oil in a medium skillet over medium-high heat until it shimmers. Add the shrimp, 1/4 teaspoon salt and a few grinds of pepper and cook, stirring occasionally, until the shrimp is pink and just cooked through, about 3 minutes. Transfer to a plate and set aside to cool.

Step 5

Add the cooked shrimp, romaine, celery and tomatoes to the bowl and toss to combine. Season with salt and pepper. The pasta salad is best if served right away.