Place dried chickpeas in a large bowl with 1 teaspoon of baking soda and cover with plenty of water to soak for at least 12 hours.
Drain the chickpeas and rinse them thoroughly under cold running water to remove the baking soda.
In a large heavy-bottomed pot, sauté the chopped onion with 30ml of the olive oil over medium heat until translucent and soft.
Add the rinsed chickpeas and the bay leaf to the pot and pour in 1.5 liters of water.
Bring the pot to a boil, skim off any foam that rises to the surface, then reduce heat to low.
Cover and simmer for approximately 75 to 90 minutes or until the chickpeas are completely tender.
Stir in the remaining 90ml of olive oil and the lemon juice.
Season with sea salt, black pepper, and dried oregano.
Simmer for an additional 10 minutes uncovered to allow the broth to emulsify and thicken before serving.