A very simple Japanese way to serve spinach that employs one of the best ways to cook most kinds of greens, which is a very quick blanching. You’ll receive a half pound of spinach in your share, so you may want to adjust the recipe accordingly.
1. Cook the spinach leaves in boiling water until just wilted, about 30 seconds. Rinse under cold running water, drain well, and chop coarsely.
2. Heat a large heavy skillet over medium-high heat. Add the sesame seeds and cook, shaking the pan constantly, until they are lightly browned. Transfer the seeds to a small bowl or mortar and crush them with a heavy wooden spoon or pestle until finely ground. Add the sugar and continue to grind. Stir in the soy sauce.
3. Toss the spinach with the dressing in a serving bowl. Serve chilled or at room temperature.