Preheat oven at 425 °F (220 °C). Pour 1 tablespoon of oil at the bottom of a cast iron skillet.
Lay in the pan in layers the potatoes, beetroots, peas, Brussels sprouts, carrots, asparagus. Salt with Himalayan salt and pepper, then spray with the mix of herbs and pour avocado oil in sufficient quantity over the vegetables and add hazelnuts butter.
Oven bake for about 45-60 minutes, while carefully watching the cooking and spraying oftenly vegetables with the juice from the bottom of the plate. Il the vegetables bruns too fast, cover with aluminium paper and continue baking. Vegetables needs to be tendre at the end of cooking.