The night before, with a knife remove the heads (the black part) from the Fava beans.
Put the fava beans in a pot, cover with water, about 1" over the Fava beans and add a pinch of salt. Let them soak overnight.
In the morning, put the Fava beans on the stove and cook at very low flame for about two hours (depending on size of Fava beans) Taste and shut off flame when they are Al Dente.
While they cook, cut the potatoes and the butternut squash in cubes.
Take a pan and add 5 Tbs of EV olive oil and saute the onion chopped finely. Add the potatoes and the Butternut squash. Saute` for 3-4 minutes.
Add enough boiling water to the pan to barely cover the potatoes and the squash. Cook for about 20 minutes. Taste a potato and shut off the flame when the potatoes are done... Al Dente. Keep some additional hot water on the side and add it if the potatoes and butternut squash get dry.
Combine the Fava beans, the potatoes and the butternut squash in a serving platter.
Add a drizzle of Ev olive oil and grated cheese, if desired.