Southern Fattoush

INGREDIENTS

• 4 teaspoons cider vinegar
• 2 teaspoons whole-grain mustard
• 2 teaspoons fresh lemon juice
• 3/8 teaspoon ground sumac
• 2 small garlic cloves, minced
• 1/2 teaspoon kosher salt
• 1/4 teaspoon freshly ground black pepper
• 6 tablespoons extra-virgin olive oil
• 2 (6-inch) pitas, torn into bite-sized pieces
• 1 cup chopped tomato
• 1 cup sliced English cucumber
• 1/2 cup diced red bell pepper
• 1/2 cup chopped fresh flat-leaf parsley
• 1/4 cup chopped fresh mint
• 1/4 cup chopped arugula
• 1/4 cup minced Vidalia onion
• 1 (15-ounce) can unsalted black-eyed peas, rinsed and drained