1. Heat the olive oil in a large pot over medium heat. Add the chopped onion, carrots, and celery. Cook until the vegetables are softened, about 8-10 minutes.
2. Add the minced garlic and cook for another minute.
3. Stir in the diced tomatoes, pearl barley, and vegetable broth.
4. Add the dried oregano and basil, and season with salt and pepper.
5. Bring to a boil, then reduce the heat and simmer for 45-50 minutes, or until the barley is tender.
6. Add the chopped kale, and cook for an additional 5 minutes until wilted.