2 tablespoons balsamic vinegar, or champagne vinegar
2 tablespoons soy sauce
1⁄2 teaspoon dried thyme or fresh thyme leaves
1⁄4 teaspoon garlic powder or fresh minced garlic
1-2 teaspoons dijon mustard (truffle mustard is preferred!)
black pepper, to taste
Preparation:
Put all ingredients, except meat, in a container or bag and combine.
Pour the marinade over the steak and cover.
Marinate in the refrigerator for 4 hours or overnight, turning the meat occasionally.
Option 1:
Remove steak from marinade and allow to come to room temperature. Pat steak dry of marinade.
Grill or broil until done as desired:
Grill: 6-7 minutes per side for rare/medium rare.
Broil: Preheat the broiler to high heat. Broil for 5-6 minutes, flip, and broil for an additional 3-4 minutes until the internal temperature reaches 125 degrees.
Let the steak rest for 10 minutes. Slice thinly.
Option 2:
Remove steak from marinade and allow to come to room temperature. Pat steak dry of marinade.
Preheat oven, with cast iron skillet inside, to 400-450 degrees.
When up to temperature, remove cast iron from oven and place on stovetop. Melt butter or oil in pan with some whole garlic cloves and fresh thyme sprigs (optional).
Sear steak on both sides until well browned. Baste with fat at regular intervals. Place entire cast iron skillet in oven to finish.