Preheat oven to 375 F degrees. Wash the potatoes really well; cut each potatoes into half or quarters if it’s too big. Place potatoes in a baking pan, drizzle some EVOO and season with salt and pepper; sprinkle rosemary then put it in the oven for about 30 minute or until the potatoes are tender. Meanwhile, heat a pan and put about a little olive oil in it and saute the shredded cabbage; cook for about 5 minutes or until just wilted then set aside.
Transfer roast potatoes in a bowl and start mashing right away while it’s very hot. Add the sauteed cabbage, drizzle with some EVOO and taste it, see if it needs more seasoning..otherwise, plate and serve.