A recipe I found while searching for Japanese recipes for our Culinary Quest. This is from "Everyday Harumi", by Japanese cookbook author Harumi Kurihara. This recipe was found on the Saveur website for Japanese cuisine.
In a spice grinder or a mortar, finely grind 6 tbsp. sesame seeds. Transfer to a small food processor. Add remaining sesame seeds, soy sauce, and sugar; process into a paste. Set aside.
Bring an 8-qt. pot of salted water to a boil. Add beans; cook until crisp-tender, about 4 minutes. Using a slotted spoon, transfer beans to a large bowl of ice water; let chill. Drain and dry beans. Whisk vinegar, scallions, and ginger with reserved sesame paste in a bowl; add beans and toss.