Prepare the sourdough mixture: In a small bowl, combine the sourdough starter with the flour. Add the olive oil, garlic powder, black pepper, and salt. Stir until well combined.
Marinate the steak: Place the steak in a zip-top bag or shallow dish. Pour the sourdough mixture over the steak and ensure it's evenly coated. Marinate in the refrigerator for at least 2 hours, or overnight for maximum flavor.
Cook the steak: Preheat a grill or skillet over medium-high heat. Remove the steak from the marinade and pat it dry with paper towels. Grill or sear the steak for 3-4 minutes per side for medium-rare, or longer depending on your desired doneness.
Serve: Let the steak rest for a few minutes before slicing and serving. Enjoy with your favorite side dishes, such as roasted vegetables or mashed potatoes.
Tips:
For a crispier exterior, dust the steak with a little more flour before grilling.
Experiment with different herbs and spices in your sourdough mixture for added flavor.
Serve with a side of sourdough bread for a complete meal.
Enjoy your delicious sourdough steak!