Pour soaked chickpeas and water into a large stock pot. Boil over high heat, partially covered, for 10 minutes.
Reduce heat to medium and remove any foam with a slotted spoon.
Add celery, onion, garlic, kombu, and olive oil. Continue cooking over medium heat with the pot partially covered for another 45 minutes.
Add salt, and continue simmering over medium heat with the pot partially covered until tender. In my kitchen, this typically takes an additional 30 minutes.
Remove aromatics, drain the chickpeas into a large bowl and reserve the broth for later use.
You’re done! Enjoy your perfect chickpeas and this delicious soup stock!