Add the shredded cabbage in a large bowl, toss with the chopped cilantro.
Sprinkle the brown sugar over the top, then pour over that the lemon juice, and finally the salt. Let it sit for 5 minutes, then toss to coat.
Cover with plastic wrap and refrigerate for at least 1 hour. Toss again when ready to serve. Keeps for up to 5 days if kept n an airtight container in the refrigerator.