Kosher salt
8 ounces dry cavatappi
Quarter of a red onion, minced
1/2 cup mayonnaise
3 tablespoons sour cream
1 1/2 tablespoons cider vinegar
1 1/2 teaspoons sugar
3/4 teaspoons dry mustard
Kosher salt and freshly ground pepper
1 cup cherry or grape tomatoes, halved or quartered if large
2 tablespoons chopped fresh dill or fresh chives
1 ear of corn, husked and kernels cut from the cob (about 1 cup)
1 medium zucchini, cut into a small dice