In a small pot, bring vinegar and sugar to a boil over medium heat. Pour mixture into a bowl and mix with the other relish ingredients.
On a work surface, season meat generously. Heat a cast-iron skillet over medium heat. Cook steaks in oil and butter for 3 to 5 minutes per side, until desired temperature. Let meat rest for 5 minutes before slicing. Serve with tomato and olive relish.
Buen provecho!