Peel the carrots and parsnips, and cut them into thin chips. Mix the vegetable chips with 2 tbsp oil, salt, pepper and thyme. Bake the vegetable chips on a baking tray for 25 minutes in a preheated oven (175 ˚C).
Slice the mushrooms and crush the garlic. Heat 2 tbsp oil in a pan, and fry the steak on both sides for 9 minutes. Remove the steaks from the pan, and allow them to cool for 2 minutes.
Meanwhile fry the mushrooms and garlic until golden brown. Serve the steak with the mushrooms and the vegetable chips, season with salt and pepper if necessary.