I'm planning to make a mushroom farro risotto for dinner party tonight and I've done my research on the net. Cooking times for farro are all over the place. Some would have you cook it for about 25-30 min. Some say you must par boil or start with already cooked farro before continuing with risotto. Some tell you to precook for 2 hrs. Which is it? How long does farro need to cook? Help.