Fresh Horseradish Root
Cut up the horseradish root into small chunks, keeping track of your total amount. Pour the horseradish chunks into a blender of some sort (I use the bullet) and add the vinegar, about 3/4 of the total amount of horseradish you ended up with. Now blend the mixture until it takes on the horseradish consistency you are familiar with. If it's too thick add more vinegar.
Enjoy! But Be Careful!
This may be the most potent horseradish you have ever had!