(Optional) Skip this if using baby spinach. If using larger heads of spinach with thick and long stems, rinse the dirt off the spinach with running tap water. Use a pair of scissors to snip off and discard the root part. Cut the spinach into 3” (8-cm) long pieces. Place in a big bowl and add cold water to cover. Soak for 5 minutes. Once done, drain the spinach thoroughly. Heat a big pot of water until boiling. Add the spinach. Blench for 20 seconds. Immediately transfer to a colander to drain off as much water as you can. Then very gently squeeze the spinach to remove some water.