1. Brush both sides of the steaks with oil, then season them generously with pepper and salt. Allow 15 to 30 minutes for the steaks to come to room temperature before you start cooking them.
2. Preheat the grill to high (450° to 550°F) for direct cooking over a high heat level, and to medium heat level (350° to 450°F).
3. Cook up the bacon and onion in a pan over medium-low heat atop the stove, stirring periodically, until the bacon develops a crisp quality and the onion is soft, this should take about 6 to 8 minutes. Turn off the heat.
4. Whisk the vinegar, garlic, and mustard in a small basin. Whisk in the oil gradually until it is emulsified, then add the salt and pepper into the mixture. In a medium mixing basin, combine the mushrooms with ¼ cup of the vinaigrette and toss the mixture well. Set the leftover vinaigrette aside.
5. Clean the cooking grates with a brush. Preheat a grill pan with perforations over medium heat. Take the mushrooms out of the marinade and arrange them on the pan in a single layer. Cook the mushrooms, turning them once or twice, over direct medium heat level, with the lid covered. Do this until they turn golden brown and tender, about 6 to 8 minutes. Wait until the undersides of the mushrooms are properly browned before moving them.
6. In the meantime, cook the steaks directly over a high heat level with the lid covered, flipping once, until done to your liking (this should take about 8 to 10 minutes for medium-rare doneness level). Allow the tenderloin steaks to sit for 3 to 5 minutes after removing them from the grill.
7. Warm the mushrooms, bacon, and onions in a pan on the grill at a medium heat level for about 1 minute, turning the ingredients often. Mix in the chives thoroughly.
8. Serve the steaks while still warm, and make sure to spoon the mushroom mixture on top. If desired, recombine the reserved vinaigrette and drizzle a little over each steak.

The recipe for tenderloin steak on a grill yields such delicious results and following the right cooking instructions is sure to guide you to excellent results. The timing guidelines in this article should also not be taken lightly to ensure that you don’t overcook or undercook your steaks on the grill.

In case you’d want a few more recipe ideas or inspiration for cooking a tenderloin steak on the grill, we have recommended this video recipe for you to watch.