In a medium saucepan, combine the rice and lentils with the broth. Bring to a boil, then reduce heat to simmer, covered, for 35-45 minutes, or until the broth has been absorbed.
Meanwhile, preheat oven to 400 degrees F and line a baking sheet with parchment paper. Toss the sweet potato cubes with 1 tablespoon olive oil and 1/4 teaspoon of salt, and spread evenly on the prepared baking sheet. Roast for 30-40 minutes, until tender and caramelized on the edges.
Heat the remaining tablespoon of olive oil in a small sauté pan. Add the garlic and sauté for 1-2 minutes, until fragrant. Add the kale and sauté a few minutes more, until wilted, then season with 1/4 teaspoon of salt.
Choose your favorite bowls, and evenly divide the cooked rice and lentils, the sweet potato, and the kale, among them. Drizzle with lemon-tahini dressing, and top with avocado chunks, if desired. Enjoy!