Hi...may I also say.....don't buy a prepared mix. Hopefully you can buy some matza meal and then go to any Jewish recipe site and you'll find many different recipes for the "knaildele"...pronounce the k and n separately. Good luck!
Oh, BTW Amy, I also like them rock hard, in fact, I try to shape them in squares, so they're easier to cut into with the soup spoon. If they were in rounded shapes, I can just see them flipping out of the soup bowl....LOL