Roasted Red Cabbage and Rainbow Pepper Slaw Recipe. This classic picnic food was long overdue for a makeover! Roasting the vegetables brings out the natural sweetness of the vegetables in this modern coleslaw. A vegetarian dish everyone will LOVE. You'll need red cabbage, red bell pepper, yellow bell pepper, cilantro, parsley, lime, apple cider vinegar, whole-grain mustard, coriander.