Blender hollandaise sauce

In the blender container add egg yolks,mustard,lemon juice,tabasco and tarragon.Cover and blend for 5-7 seconds. Melt the butter in the microwave for 1 minute ,or til completley melted and hot..Start the blender on high speed with cover on.Pour the butter in ,in a thin stream ,slow stream.It should thicken quickly.Season with salt and pepper to taste.Serve immediatly.