Buddha's Hand is very high in Vitamin C.
Buddha's Hand is at its best when used fresh, but can be frozen for use at a later time and still be better than the zest you would get from the average lemon rind.
When you can't find Buddha's Hand at your local specialty store (and it is difficult to find), use the peel of a large lightweight lemon, which will have more skin than meat (just the opposite from how you'd usually choose your citrus).