Ingredients

• 2 tablespoons red wine vinegar
• 2 cloves garlic, minced
• 1 tablespoon cracked black pepper
• 1 teaspoon dried rosemary leaves, crumbled
• 1 teaspoon dried oregano
• ¼ teaspoon kosher salt
• ¼ cup olive oil
• 1 ½ pounds flat iron steak
• 3 tablespoons softened unsalted butter
• 1 ounce crumbled blue cheese
• 1 tablespoon chopped fresh chives
• ⅛ teaspoon cracked black pepper