1. Cut spinach into half-lengths, put it into an ovenproof bowl. (Place the leaves under the stalks.) Cover with the edge-open wrap and microwave on 600W for 3minutes. (1 and half minutes on 1200W)

2. Soak in cold water, drain and cut into 3cm lengths.

3. Mix well with the kombu-soy sauce and serve

* Without using microwave, boil the spinach in a pot. Rinse in cold water and squeeze out the excess water

For how long you should cook with your microwave oven, see Cooking Time vs Wattage Conversion.
For more tips of using Microwave Oven, see Sachiko's Guideline to Microwave Cooking.