Roast Flank Steak With Potatoes Amd Portobell

• 46 by
• 4 baking potatoes
• 4 portobello mushrooms
• 2 roasting on the lower oven rack (pan)
• 1 1/2 roasting (pan)
• 1 black pepper (freshly ground)
• 1/2 garlic mixture (into pan)
• 525 gr flank steak
• 240 ml olive oil
• 60 ml oil