Meanwhile, in another large saucepan, heat 1 tbsp (15 mL) of the oil over medium heat. Add onions, thyme and half of the salt; cook for 8 minutes, stirring frequently, or until onions are very soft. Add lentils; cook, stirring, for 1 minute. Stir in broth, scraping up any browned bits on bottom of pan. Cook uncovered for about 20 minutes or until lentils are tender and broth is absorbed. Transfer to bowl along with barley; let cool slightly.