How to Make It
In a large bowl, toss the red cabbage with salt and pepper. In a medium bowl, whisk the vinegar with the sugar and salt until they dissolve. Pour the vinegar over the cabbage and toss well. Let stand at room temperature for 2 hours.
Add the mango and sesame seeds to the cabbage and toss well. Transfer the slaw to platters, garnish with the scallions and sesame oil and serve.