I know there are many recipes out there for a whole roasted beef tenderloin. I myself have several recipes, and I love them all. But this is always a favorite and very basic. You will have to purchase green peppercorns packed in water (Whole Foods or most specialty markets carry these, but some local grocers carry them as well) and the tenderloin itself which will be expensive, but it is worth it - this is just a classic simple dish. Besides, if you are going to buy an expensive cut of beef for a special occasion ... you want to treat it with respect and not cover up the flavor. It is five (5) ingredients for the marinade/rub; then pan seared in butter and oil and finished in the oven. A simple finish with a green peppercorn butter. It is perfectly elegant. This isn't an every day dish, but great for a holiday or special occasion. And if you don't want to make as much, simply cut the recipe in half. Prep time does not include the marinade time.