Soak the dried fava beans in abundant cold water for at least 12 hours, or overnight. Drain and rinse thoroughly.
2
Finely dice the yellow onion.
3
In a large, heavy-bottomed pot or Dutch oven, heat 30g of the extra-virgin olive oil over medium heat. Add the diced yellow onion and sauté gently until softened and translucent, about 8-10 minutes, without browning.