Freekeh Vegetable Soup

Name: Freekeh Vegetable Soup
Ingredients: 1 cup freekeh (cracked or whole); 3 tablespoons extra virgin olive oil , plus more for drizzling; 1 large onion , diced; 1 medium kohlrabi , rind and tough outer membranes peeled, diced; 2 medium carrots , diced; 1 teaspoon kosher salt , plus more for seasoning; 1/2 t easpoon freshly ground black pepper , plus more for seasoning; 3 garlic cloves , minced; 8 cups vegetable or chicken broth, plus more if needed; 2 medium zucchini , diced; 1 Parmesan rind or 1 tablespoon nutritional yeast (optional); 2 teaspoons chopped fresh zaatar or oregano; 1/4 teaspoon cayenne pepper; Chopped fresh herbs (parsley, chives, scallions, or more za'atar), for garnish