1. Bring 8 Cups of water to a boil in a large pot. Reduce heat, add barley, simmer until just tender (about 1 hour)
2. Add 2 Cups stock to the pot and bring it to a boil. Reduce heat, add onion, garlic, red pepper flakes, and salt. Season with pepper. Simmer until barley is soft (about 20 minutes)
3. Add beans with liquid, kale, and remaining 2 cups of water and the last cup of stock. Simmer until kale is tender and cooked through (about 7 minutes)
4. Divide among 4 bowls or store in one container.