Swaps: No masa harina? Fine cornmeal works with a different texture. Add green onion, radish, or parsley to the slaw. Stuff the arepas with beans, cheese, or grilled veggies. Storage: cooked arepas keep 3 days refrigerated - reheat in a skillet or toaster oven. The slaw keeps 1-2 days. Arepas freeze well; reheat straight from frozen in a hot skillet.