Rinse the arame in a strainer under running water. Place the arame in a pot with enough water to cover and let sit for three to five minutes. Bring to a boil, cover, reduce the heat to medium-low and simmer for ten minutes. Remove the lid, add tamari, and boil until all the liquid has evaporated. Add the lemon rind and sesame seeds and mix well. Serve with lemon wedges and garnish with fresh sliced scallions. Serves 4.