Follow soaking and cooking instructions for beans.
While beans are cooking, clean and slice scallions.
Toast sesame seeds in a skillet or frying pan with no oil. Cook on medium-low heat for 2-3 minutes, or until they turn brown and occasionally pop.
Mix soy sauce, rice vinegar, sliced scallions and sesame seeds together in a bowl.
Drain cooked beans, and mix into bowl with other ingredients. Salt to taste. Serve cooled.