This recipe for Beef Wellington Bites is perfect for your next winter gathering, football party, or pre-dinner appetizer. The Beef Wellington origin goes back to 1815, when it was made in celebration for the Duke of Wellington's victory at the Battle of Waterloo. It's traditionally served as a main course, often with prosciutto or parma ham added to the mix. This appetizer Beef Wellington recipe makes bite-sized versions of the classic dish, perfect for a passed hors d'oeuvre at a party.Recipe for Beef Wellington Bites:2 tablespoons extra virgin olive oil1 pound beef tenderloin, cut into cubesKosher salt and freshly ground black pepper8 ounces cremini mushrooms, stemmed and finely chopped1 sprig of thyme leaves1 tablespoon butter1/4 cup finely diced shallot1/4 cup sherry wine, white wine, red wine or cream1 sheet frozen puff pastry, thawed Egg wash: 2 egg yolks mixed with 1 teaspoon waterBeef Wellington Sauce: 1/4 cup sour cream mixed with 1 tablespoon prepared horseradishNote: The Beef Wellington temperature should be at 120 F when you remove it from the oven. Do not overcook this wonderful tender beef!