Vegetarian Gyros

Name: Vegetarian Gyros
Prep time: 30 min
Cook time: 15 min
Total time: 45 min
Cuisine: Mediterranean
Ingredients: 2 small sweet potatoes (about 8 - 12 ounces total); 2 tablespoons extra-virgin olive oil (divided); ½ teaspoon cornstarch; 2 teaspoons garlic powder (divided); 1/2 teaspoon Diamond-Crystal kosher salt (plus more for seasoning); Black pepper; 2 tablespoons tomato paste; 2 tablespoons harissa paste; 1 teaspoon dried oregano; 1 teaspoon ground cumin; 3/4 cup water; 1 15-ounce can chickpeas (drained and rinsed); A pinch of hot sauce (optional | for extra heat); 2 large pocketless pitas (preferably Greek-style pitas or “Gyro” bread | warmed); Tzatziki sauce (recipe below); 1 tomato (thinly sliced); 1 cup shredded lettuce; ½ medium red onion (thinly sliced); 1 cup Greek yogurt; 1 Persian cucumber (grated); ¼ cup fresh dill (chopped); 1 large clove garlic (grated); Squeeze of lemon; Salt (to taste)