Turkish Chickpea Salad

Ingredients

• 1 onion ((red or yellow; halved and very thinly sliced))
• 1 teaspoon ground sumac
• 1 teaspoon ground cumin
• 1 teaspoon Aleppo pepper
• 1 (15-ounce can) chickpeas ((drained and rinsed))
• 8 sun-dried tomatoes in oil ((well drained and chopped))
• 1 cup chopped spinach
• ½ cup chopped fresh flat-leaf parsley
• ½ teaspoon finely minced or grated garlic
• 2 tablespoons extra-virgin olive oil
• 2 tablespoons fresh lemon juice
• Kosher salt and freshly ground black pepper ((to taste))
• Ground sumac ((for sprinkling))
• Pita bread