In a saucepan, heat up the extra-virgin olive oil. Add the onions and gently saute until lightly golden, then add the chickpeas, rosemary, salt, and freshly ground black pepper. Remove from the heat and with the back of a fork mash 1/3 of the chickpeas or to your desired texture. Return to the heat and add the water and cook for approximately 15 minutes. A drizzle of olive oil and fresh gratings of Parmigiano cheese is optional before serving.