Remove the core from the cabbage and place it, core side down, in the boiling water. Cover and let the head of cabbage boil for 7-8 minutes. Remove the softened outer leaves and place them on a plate to cool. Cover the pan and cook the cabbage for 6-8 minutes, checking and removing the outer leaves as they soften, placing them on the plate to cool. When you get down to the center of the cabbage and the leaves are too small for rolls, cover the pan and cook the cabbage until crisp-tender. When done, remove the cabbage from the heat, coarsely chop it and set it aside.