While grill heats, rub steaks with olive oil and season with Tony’s Steak and Roast Seasoning. Grill steaks over medium hot flame to rare or medium rare.
Meanwhile, simmer demi-glace and wine in a saucepan, reducing by half. Stir in fresh berries to taste and cook to break down. Remove from heat and swirl in butter, serve immediately over grilled steaks. For a creamy sauce, whisk in sour cream or Creme Frache to taste.