This video demonstrates a recipe for Hollandaise sauce, which is an egg based sauce similar to mayonnaise except that it's warm and made with butter. First he melts the butter in a sauce pan and lets it boil. He breaks some eggs into a tall glass and adds some vinegar. He pours the hot butter into the glass and uses a Bamix immersion blender to mix the ingredients, whipping it up until the mixture is thick and creamy in the glass. He then cooks a piece of salmon to go with the Hollandaise sauce. The specific ingredients for the sauce are listed at the end of the video, so you can make this yourself at home.