In a large pot, heat the oil over medium heat. Add the onion and sauté for 1 minute. Add the celery and carrots and sauté for 4 minutes. Stir in the garlic and sauté for 1 more minute.
Add the barley, broccoli, and vegetable broth. Bring to a boil over medium-high heat and cook until the barley is tender, about 25 to 30 minutes.
Stir in the chopped cilantro. Garnish with red chili flakes if using, and serve hot.
Video
Notes
Use high-quality bouillon/broth: It packs in a ton of flavor, so use a rich, full-bodied one for the best vegan barley soup.
For a thinner soup: Add extra broth.
For more flavor: Sauté the vegetables until lightly caramelized for complex flavor depth.
To avoid thickening soup: Store the barley separately so it doesn’t soak up broth.