Whisk 5 tablespoons vinegar, olive oil, mayonnaise, pepperoncini juice, garlic, red pepper flakes, 1/2 teaspoon salt, and 1/2 teaspoon pepper in medium bowl.
Bring 4 quarts water to boil in large pot. Add 1 tablespoon salt and pasta and cook until al dente. Drain pasta, return to pot, and toss with 1/2 cup dressing and remaining vinegar. Adjust seasonings, spread dressed pasta on rimmed baking sheet, and refrigerate until chilled, about 30 minutes.
Meanwhile, bring remaining dressing to simmer in large skillet over medium-high heat. Add mushrooms and cook until they release their juices and are lightly browned, about 8 minutes. Transfer to large bowl and cool.
Add meat, provolone, roasted red peppers, chopped pepperoncini, basil, and cooled pasta to mushrooms and toss well. Season with salt and pepper. Serve at room temperature. Salad can be refrigerated for up to 3 days.
Time to Prepare: 45 minutes
Submitted By: Laura (LraM)
Original Source: America's Test Kitchen
I watched the show- drooled while they made it and had to make it myself. *yummy* The mushrooms are divine!