For an even more intense pesto flavor, let the steaks marinate in the pesto for at least 30 minutes before cooking. Reserve the leftover pesto to toss with pasta or spread on sandwiches. The infused olive oil can be used for salad dressings or drizzled over grilled vegetables. Ensure the steaks are fully submerged in oil for even cooking and optimal tenderness. Use a high-quality olive oil for the best flavor.