Vegetarian Gyros

Name: Vegetarian Gyros
Prep time: 40 min
Cook time: 20 min
Total time: 1 h
Cuisine: Mediterranean
Ingredients: 1 large sweet potato (about 8 - 12 ounces total); 2 tablespoons extra-virgin olive oil (divided); ½ teaspoon cornstarch; 1 1/2 teaspoons garlic powder (divided); 1/2 teaspoon Diamond-Crystal kosher salt (plus more for seasoning); Black pepper; 2 tablespoons tomato paste; 1 - 2 tablespoons harissa paste; 1 teaspoon dried oregano; 1/2 teaspoon ground cumin; 3/4 cup water; 15 ounces canned chickpeas (drained and rinsed); 1 cup Greek yogurt; 1 Persian cucumber (grated); ¼ cup fresh dill (chopped); 1 large clove garlic (grated); Squeeze of lemon; Salt (to taste); 2 large pitas (preferably Greek-style pitas or “Gyro” bread | warmed); A pinch of hot sauce (optional | for extra heat); Tzatziki sauce (recipe below); 1 tomato (thinly sliced); 1 cup shredded lettuce; ½ medium red onion (thinly sliced)