Cook the diced onion in 2 tbsp oil in a large pot for 5 minutes, then add the garlic, a sprig of chopped rosemary and the pepper flakes for 1 minute.
Stir in the tomato paste for 1 minute, then add the drained chickpeas and broth and simmer 10 minutes.
Mash or blend about a third of the chickpeas right in the pot to make it creamy.
Add the pasta and simmer, stirring often, 9-10 minutes until tender, adding a splash of water if it gets too thick.
Season with salt and pepper and drizzle with the remaining olive oil. It should be thick and stewy, somewhere between a soup and a pasta.
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