This is my way of making the perfect steak;
Massage salt, pepper, olive oil and rosemary into a scotch fillet steak. Sear each side of the steak in a hot pan until golden. Add a tablespoon of butter at the end and coat the steak in the melted butter. Transfer to the oven for 15 minutes. For the mushroom sauce, put sliced mushrooms and thyme into a pan with olive oil. When golden, add either 1/4 cup of cream (carnation milk if you wanted a lighter version) and parmesan and let simmer. When the steak is ready, pour the juices from the steak pan into the mushroom sauce. Let steak rest for about 8 minutes and serve.