Meanwhile, bring broth to a boil in a medium saucepan over high heat. Add the quinoa and return to a boil. Cover, reduce heat to a simmer and cook gently for 8 minutes. Remove the lid and, without disturbing the quinoa, add edamame. Cover and continue to cook until the edamame and quinoa are tender, 7 to 8 minutes longer. Drain any remaining water, if necessary.