Step 1

Bring a large pot of salted water to a boil. Add the cavatappi and cook according to the package directions. Drain and rinse under cold water. Set aside.

Step 2

Meanwhile, soak the onion in cold water for 5 minutes and then drain.

Step 3

Whisk together the mayonnaise, sour cream, cider vinegar, sugar, mustard, drained red onion, 1/2 teaspoon salt and a few grinds of pepper until smooth.

Step 4

Add the cooked cavatappi, tomatoes, dill, corn and zucchini to the dressing and stir to coat.