No steamer basket required for this recipe. A modest amount of liquid in a standard skillet steams the broccoli to perfection.
Place broccoli, mirin, tamari, ginger, oil, and 1/4 cup water in large (2- to 3-qt.) skillet. Cover, and bring to a simmer over medium heat. Steam 4 minutes, or until broccoli is bright green and crisp-tender. Sprinkle with salt and sesame seeds.