Step 1

Place 1 pound dried macaroni and 3 cups water in an Instant Pot or electric pressure cooker. Lock the lid in place and check that the valve is set to seal. Cook on HIGH pressure for 6 minutes. Meanwhile, prepare the vegetables and dressing.

Step 2

Pour off 1/4 cup liquid from 1 jar giardiniera vegetables and place in a large bowl. Drain off the remaining liquid. Coarsely chop the giardiniera vegetables and thinly slice 1 bunch scallions, and add both to the bowl. Add 1 1/2 cups mayonnaise and 1/2 cup sour cream and stir to combine.

Step 3

When the macaroni is ready, quick release the pressure. Drain the macaroni if needed. Rinse under cool water and drain well. Add to the dressing and toss to combine. Cover and refrigerate until chilled, about 4 hours.