Edamame Yep, it’s tryptophan again, in yet another unexpected food. A cup of soybeans has over 122% of your daily recommended value of tryptophan, and edamame is the freshest (and some might say tastiest) way to eat soy.Edamame is a preparation of immature soybeans in the pod, found in cuisines with origins in East Asia. The pods are boiled or steamed and may be served with salt. In Japan, they are usually blanched in 4% salt water and not served with salt.