Bring the brown rice, water, stock and salt to a boil.
Cover and reduce the heat to a simmer.
While the rice is cooking, cover the arame with warm water and let soak for 10 minutes.
Drain the water off the arame.
After the rice has cooked for 40 minutes, add the edamame and arame. Cook for an additional 5-10 minutes or until liquid is absorbed and rice is tender.