The Life-Changing Persian Soup I’ve Been Making for 15 Years (and Counting)

Name: The Life-Changing Persian Soup I’ve Been Making for 15 Years (and Counting)
Prep time: 15 min
Cook time: 1 h 5 min
Total time: 1 h 20 min
Cuisine: Middle Eastern
Ingredients: 2 large yellow onions; 4 cloves garlic; 1/4 cup olive oil; 3 tablespoons dried mint; 1 teaspoon kosher salt, plus more as needed; 1 large yellow onion; 2 teaspoons kosher salt, or more to taste; 1/2 teaspoon freshly ground black pepper; 1 teaspoon ground cumin; 1 teaspoon ground coriander; 1/2 teaspoon ground turmeric; 1/2 cup white basmati rice; 1/2 cup pearled barley; 1/2 cup French green lentils; 8 cups water, plus more as needed; 1 (about 15-ounce) can garbanzo or cannellini beans; 2 ounces baby spinach (about 2 cups); 1 bunch fresh parsley; 1 bunch fresh cilantro; Plain Greek yogurt, for serving