LONDON -- Jill Ralph and Fool analyst Nate Weisshaar talk horse meat and Christmas trading as they digest the performances of Tesco (TSCO 0.14%)J Sainsbury (SBRY 0.77%)Ocado (OCDO -1.84%), and William Morrison (MRW) over the Christmas season.

Tesco's shares suffered a small blip on the "horse meat" news following its continued recent recovery -- and presented a buying opportunity for canny investors. Which is precisely what Warren Buffett did earlier last year, following a poor Christmas trading statement. You can find out what attracted Buffett to the company and the price the billionaire investor paid for his shares, by downloading an exclusive Motley Fool report "The One European Share Warren Buffett Loves."