8 ounces elbow macaroni
1/4 cup chopped red onion, soaked in cold water for 10 minutes, drained
1 red bell pepper, finely chopped
1 celery stalk, finely chopped
1/2 cup mayonnaise
2 tablespoons sweet pickle relish
1 tablespoon cider vinegar
1 teaspoon Dijon mustard
1/2 teaspoon sea salt
1/4 teaspoon ground black pepper