1 c. sesame seeds
4 c. water
4 oz. arrowroot starch (kuzuko)
1 tsp. salt
1 tsp. sake
2 c. water

Toast sesame seeds and place in blender to make a smooth paste. Mix 4 cups water in blender to make smooth. Strain and squeeze mixture into saucepan through cloth. Add arrowroot starch, salt, sake and water.

Heat mixture constantly and when mixture comes to a boil and starts to harden, lower heat and cook 5 minutes, constantly stirring. Pour in square pan and let it set and then refrigerate. When serving, cut into 2 square inch size, with soy sauce and horseradish.