The inner stem (or core) of cabbage must be removed so that the leaves cook evenly.
Cut the cabbage in half. Cut a wedge around the core and remove it, working from the top to the stem of the cabbage. ALTERNATIVELY, quarter the cabbage and slice away the core.
To shred the cabbage: set it cut-side down on a board and cut crosswise in very fine slices. After shredding, discard any thick ribs. Roll loose leaves and cut crosswise into shreds.