Step 1 Preheat oven to 175 °C/ 350 °F (conventional), or 155 °C/ 310 °F (fan assisted). Place the cabbage leaves in a large bowl and cover with boiling water, let sit for 5 minutes (I use an electric kettle to make quick work of this step), alternatively bring a pot of water to a boil and submerge cabbage leaves for 3-5 minutes, until crisp tender. Drain.