In a small bowl or plate, combine the ingredients for marinade (soy sauce and olive oil) Marinate the steak strips in the marinade for between 30 and 1 hour.
While the broccoli heads are being cooked, wash them and then cut them into florets. Boil the broccoli florets for about 1 to 2 minutes. Rinse with cold water.
Let the steak cool down. Heat oil and 1 tablespoon butter in an large saucepan on medium-high heat. Sear the steak strips in batches, turning once or twice, until they are browned and crispy on both sides. You can add more oil if necessary. Set the steak strips aside from the skillet.
Heat the skillet to medium. Heat 2 tablespoons butter. Next, add the lemon juice, minced garlic and beef broth. Once the sauce has reduced to a simmer, add the fresh parsley leaves and broccoli florets. Toss the mixture regularly until it is smooth and the broccoli is cooked to your satisfaction.
5 Return the steak strips to the pan and heat quickly. Serve immediately with chili flakes, parsley, and more lemon slices. Enjoy!