Season both sides of the steak with salt and pepper and place in a ziplock or reusable storage bag with the balsamic vinegar and olive oil and marinate in the fridge for 30 minutes, or overnight
1 1/2 lbs sirloin or ribeye steak, 1/3 cup balsamic vinegar, 2 Tablespoons olive oil, Salt and pepper to taste
While the steak is marinating, cook the pasta according to the package directions. Bring a large pot of salted water to a boil then add the pasta and cook until al dente. Reserve 1/2 cup of the pasta cooking water then drain the pasta from the rest of the water and set aside.
12 ounces fettuccine
Heat a large skillet over medium high heat. Remove the steak from the marinade, shaking off any excess. Cook the steak for 4 minutes on each side or until it reaches your desired doneness. I like to remove the steak when it reaches an internal temp of 135°F for medium-rare steak (target temp 145°F). Rest for 10 minutes.
While the steak is resting, melt the butter in a deep skillet over medium-high heat. Add the garlic and cook for 1-2 minutes, until fragrant. Add the flour to the butter and stir well to create a paste (a roux). Cook the roux for 2-3 minutes to ensure the flour is fully cooked.
3 Tablespoons unsalted butter or vegan butter, 3 cloves garlic, 3 Tablespoons flour
Slowly whisk in the milk then add the salt and pepper. Continue to stir and cook for about 5 minutes, until thickened. Add the parmesan cheese and stir until melted and combined.
2 cups milk, 1 teaspoon kosher salt, 1/2 teaspoon black pepper, 1/2 cup parmesan cheese
Stir in the cooked pasta. If the sauce seems too thick, pour in the reserved pasta cooking water a few tablespoons at a time to reach your desired consistency.
Slice the steak into thin pieces against the grain and top the pasta. Drizzle with balsamic glaze and top with gorgonzola and parsley if desired.