The key to cooking the best steak at home is to use an instant read thermometer. The steak is first cooked low and slow in the oven before quickly pan searing it, and it's so easy to work out exactly when you take it out of the oven. Take the steak out of the oven when it hits these temperatures: Medium Rare: 90-95F (32-35c) Medium: 100-105F (38-41c) Medium Well: 120-125F (49-52c) Well Done: 155 (68c) and up