1: Preheat the oven to 180C.
2. Wash and peel the vegetables.
2: Using a food processor or a mandolin, slice the vegetables into discs.
3: Layer the slices into an oven proof dish, standing up, alternating the vegetables.
4: Mix the garlic with the oil and drizzle over the vegetables.
5. Sprinkle some sage and rosemary leaves in between the vegetables along with black pepper, sea salt and polenta.
5: Roast for about 1 hour until crispy and browned.