Grilled Halloumi Wraps | America's Test Kitchen

Ingredients

• 1 red onion , halved and sliced thin
• 3 tablespoons red wine vinegar
• 1 tablespoon ground sumac
• ¾ teaspoon table salt , divided
• 2 tablespoons lemon juice
• 1 garlic clove
• ½ cup plain Greek yogurt
• 1 large red bell pepper
• 4 (8-inch) pitas , divided
• 12 ounces halloumi cheese , sliced crosswise ½ inch thick
• 1 tablespoon extra-virgin olive oil
• ¼ teaspoon red pepper flakes
• 2 ounces (2 cups) arugula