2 (15 ounce) cans fire-roasted diced tomatoes with juice
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2 tablespoons ground coriander
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salt and freshly ground black pepper to taste
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5 cups vegetable broth
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7 (6 inch) corn tortillas, cut into strips
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1 small lime, zested and juiced
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coarsely crumbled tortilla chips (optional)
Instructions
Combine rice, 1 tablespoon vegetable oil, 1 tablespoon cumin, 1 tablespoon paprika, garlic powder, chili powder, oregano, 1/2 teaspoon salt, 1/2 teaspoon pepper, and crushed red pepper in a saucepan over medium heat. Toast rice until lightly browned, about 5 minutes. Add water and bring to a boil. Cover, reduce heat, and simmer until rice is cooked through according to package directions, 45 to 50 minutes.
Meanwhile, heat remaining tablespoon of oil in a large stockpot over medium heat and cook onions, celery, bell pepper, and garlic until crisp-tender, about 5 minutes. Add frozen corn and saute until hot, 3 to 5 minutes. Add pinto, black, and kidney beans, tomatoes with their juices, coriander, remaining 1 tablespoon cumin, remaining 1 tablespoon paprika, and season with salt and pepper. Cook for about 5 minutes. Pour in vegetable broth and add tortilla strips. Once rice is cooked, add it to the soup.
Cook tortilla soup over medium heat until tortillas begin to break down and thicken the broth, about 30 minutes. Add lime zest and juice and cook for 5 minutes more.
Serve hot and garnish with coarsely crumbled tortilla chips.