How to Make It
Preheat the oven to 425°. Put the potatoes on a large rimmed baking sheet and drizzle with 1 tablespoon of the oil. Season with salt and pepper and toss to coat. Bake on the bottom shelf of the oven for about 18 minutes, until the potatoes are tender and browned on the bottom. With a metal spatula, scrape the potatoes loose from the pan.
Meanwhile, in a large, deep skillet, heat 2 tablespoons of the oil. Add the carrots, season with salt, cover and cook over moderate heat until softened, about 5 minutes. Add the remaining 1 tablespoon of oil to the skillet along with the cabbage. Cover and cook over moderately low heat, stirring occasionally, until the cabbage is tender, about 15 minutes. Add the chile and rosemary, cover and cook until the chile is tender, about 2 minutes. Season with salt and pepper. Gently stir in the roasted potatoes, transfer to a bowl and serve.