Filet with Balsamic Vinegar
Filetto al Balsamico
Put butter and olive oil in a hot skillet on medium heat. As soon as butter starts foaming add fillets.

Brown the fillets on all sides.

Add salt and pepper.

Cook for about 5 minutes. Add balsamic vinegar. Let the balsamic vinegar  evaporate, and serve at once.

1 oz (30 g) butter

2 tablespoons extra-virgin olive oil

1 lb (440 g) filet mignon

salt and pepper

2 tablespoons balsamic vinegar