Take out the steaks from the fridge at least 30 min before cooking to bring to room temperature.
Salt, pepper the steak generously and rub them well. Heat a frying pan on high and add olive oil.
Cook one side of the steaks about 3 min (cover with a lid) and then turn and cook about 3 min. Using a tong, cook the sides too. Remove the steak and keep it warm. (wrap in foil)
In the same pan, add red wine, balsamic vinegar, and simmer for a few minutes until the liquid reduces to half.
Add more butter and season with pepper (or salt).
Rest the steak at least 10 min before serving. Serve with the wine sauce.
Notes
Steak should be at least 1/2 inch or more to get medium to medium rare doneness.