In a mixing bowl, blend the oil, balsamic, salt and pepper. Then pour the marinade over the flank steak in a pan. Allow the steak to marinade for 20 to 30 minutes.
For the zucchini, heat a shallow saucepan over high heat and bring 4 cups of water to a boil. Reduce the heat and add the zucchini to the water and simmer for 2 minutes. Remove from the water and place in a colander to drain.
To prepare the steak, heat a large saute pan over high heat until the verge of smoking. Remove the steak from the marinade and remove any excess marinade before cooking. Then reduce the heat and place the steak in the pan. Cook the steak on each side for 4 to 5 minutes, turning to avoid scorching. If the steak begins to crust or brown, reduce the heat. After cooking to desired temperature, remove from the pan and allow the steak to rest.
To build the plate, add a portion of hot potatoes, steamed zucchini and steak, sliced on bias. Then finish with the veal stock.