1. 1. Preheat the grill to medium-high heat.

2. 2. Season the beef tenderloin steaks with salt and pepper.

3. 3. Grill the steaks for about 4-5 minutes per side for medium-rare, or until desired doneness is reached.

4. 4. While the steaks are cooking, blanch the haricots verts in boiling water for 2-3 minutes, then transfer to an ice bath to stop the cooking process.

5. 5. Once the steaks are done, let them rest for a few minutes before slicing.

6. 6. Serve the sliced beef tenderloin steaks with the blanched haricots verts and a dollop of sour cream on top.

7. 7. Enjoy your delicious Beef Tenderloin Steaks with Haricots Verts and Sour Cream!