The recipe makes extra dressing, which will keep for a few weeks in the refrigerator.
(from Japanese Home Cooking by Shunsuke Fukushima)
1/4 cup soy sauce
1/4 cup sugar
3 tbsp toasted sesame seeds, ground in a mortar and pestle
1 large bunch spinach (leaves only)
sesame seeds (for garnish)
Bring soy sauce and sugar to a boil in a small saucepan, stirring occasionally until sugar dissolves.
Remove from heat and stir in ground sesame seeds.
Wash spinach leaves well in several changes of cold water.
Half fill a large saucepan with water and bring to a boil.
Add spinach, return to a boil, and cook until the spinach is wilted (about a minute).
Drain the spinach and squeeze out as much liquid as possible.
Toss with a few tablespoons of dressing, then garnish with sesame seeds.