1. 1. In a mixing bowl, combine 1 cup of bread flour, 1 cup of all-purpose flour, and 2 tablespoons of cornstarch. Mix well.

2. 2. Season the sirloin steak with salt and pepper on both sides.

3. 3. In a skillet, heat 2 tablespoons of butter and 1 tablespoon of extra-virgin olive oil over medium-high heat.

4. 4. Sear the sirloin steak for 4-5 minutes on each side for medium-rare, or adjust the cooking time according to your preference.

5. 5. Remove the steak from the skillet and let it rest for a few minutes before slicing.

6. 6. In the same skillet, add 2 tablespoons of tomato paste and cook for 1-2 minutes.

7. 7. Add 1/2 cup of water to the skillet and stir to combine with the tomato paste, creating a sauce.

8. 8. Serve the sliced sirloin steak topped with the tomato paste sauce.

9. 9. Enjoy your delicious Sirloin Steak with Tomato Paste Sauce!