Given the task definition and input, reply with output. In this task, you have to identify the named entities (NER) which are the ingredients required given its directions. Named entities are the names of the items without their quantity.

Make sauce - puree lowfat sour cream, parsley, horseradish, lemon juice, and salt in food processor., Transfer to bowl., Mix in whipped cream., Refrigerateup to 4 hrs., Remove beef from frig 1 hr., before roasting., Preheat oven to 450 ., Place beef in foil lined pan., Combine oil and salt; brush over beef., Rub all over with crushed pepper., Roast 35 to 40 mins., till meat thermometer reaches 130 for med-rare., Let stand 15 minutes., or possibly up to 2 hours., before slicing., Slice beef and arrange on platter., Serve hot or possibly at room temp with Horseradish Sauce.
sour cream, Parsley, horseradish, Lemon juice, Salt, Heavy cream, beef tenderloin, Extra virgin olive oil, Salt, black pepper