Preparing frozen edamame (fresh soybeans) in the shell is simple. They’re pre-cooked, so all you need to do heat and season them. Simply drop the frozen edamame into a pot of salted boiling water, cook for 4-5 minutes, drain and rinse with cold water and season with sea salt. pescatarian put them in cold water and brings it to a boil; as soon as it starts boiling rapidly he drains and salts. Some microwave: place the edamame in a bowl with 3-4 Tbsp. water and cover, nuke for a minute or two, drain the water, and salt. For additional flavor, try squeezing on some lime juice before salting, or dressing your edamame in curry powder fried in oil.