- 2 tablespoons olive oil
 - 1 red onion, coarsely chopped
 - 3 cloves garlic, minced
 - 4 cups vegetable broth
 - 1 (14.5 ounce) can Italian-style diced tomatoes
 - 1 1/4 cups red lentils, rinsed and drained
 - 1/2 cup uncooked brown rice
 - 1 tablespoon Italian seasoning
 - 1 tablespoon dried celery flakes
 - 1 teaspoon ground white pepper
 - 1 teaspoon dried marjoram
 - 1 1/2 tablespoons balsamic vinegar
 
- Heat olive oil in a large pot over medium heat. Add onion and garlic; cook and stir until softened, about 5 minutes. Stir in broth, diced tomatoes, red lentils, brown rice, Italian seasoning, celery flakes, white pepper, and marjoram. Bring soup to a boil; reduce heat, cover, and simmer until lentils break down and rice is tender, about 55 minutes.
 - Stir balsamic vinegar into the soup just before serving.