Curried Vegetable Roti

Name: Curried Vegetable Roti
Ingredients: ¼ cup vegetable oil; ¾ pound zucchini (about 2 small cut into 3/4-inch pieces); ½ pound okra (tops trimmed); 4 scallions (cut into 1/2 -inch pieces); 1 serrano chile (seeded and thinly sliced); Salt and freshly ground pepper; 15 ounce can chickpeas (drained); 1 ½ tablespoons Madras curry powder; 1 large tomato (coarsely chopped); 4 ounces baby spinach ( cups); 2 tablespoons water; ¼ cup plain whole-milk yogurt; 4 large pita breads (warmed); Cilantro sprigs (for garnish)