Yes. It is best to go ahead and cook the cabbage leaves to soften them for layering. To blanch cabbage,  fill a large pot with water and bring to a boil. Place the cabbage leaves in the boiling water for about 10 to 15 minutes. Drain and pat dry using a paper towel before layering. Let the cabbage leaves cool to the touch, so that you can handle them without getting burned, and then you can continue making the lasagna.