A zester, for those of you not knowing, is simply a small, glorified cheese grater. It is used to zest the peels or skins from
various fruits, vegetables, and in this case people. The angle of the "blades" is so slight, that only extremely small slices are
sheared from the subject with each pass of the instrument.
The first pass or two may not even cause the victim pain, just a slight scraping sensation. How many passes are required
depends entirely on the area scraped. The inside of the upper arm will require less than the outside of the thigh, for instance.
It is the desired end effect that you must keep in mind when deciding how many passes to make.
Once the skin has barely begun to bleed is the prime opportunity to apply any grainy substances. The blood spots should appear
splotchy, and irregular. A few more scrapes will create longer, deeper gouges in the flesh. This is the time to apply the coating
liquids to the raw area. It is possible to find single hole zesters, which are often used for bartending and garnish purposes. These
make excellent supplemental tools for the latter stage. Using the gouges already created, one can remove a long, thin strip of
flesh. If lucky, the strip can also be pulled by hand once it is long enough to grip firmly.
As a last resort, one can conceivably dig all the way to the bone, through muscle and sinew with a zester. Beware though, this is
a very messy prospect.
Areas to consider:
--Softer skin, which comes in contact with other parts of the body. Examples would be the armpit, inner thigh, groin, etc. A small
amount of scraping can leave the subject in pain for days, sometimes even weeks with this method, especially if in a warm
environment where sweat is prevalent.

--Skin near bony areas. Examples are the knuckles, wrist, and shins. Without too much work, the bone can be exposed, allowing
all sorts of other torturous activities. Knuckles have the added benefit of taking longer to heal, as they are constantly being
flexed, and good enough wounds will continue to break open.

Additional ingredients:
--Though lemon juice seems to be a popular, if not cliche choice, it's really one of the minor additives. Second perhaps only to
salt.

--Hot pepper flakes are a good choice, as the oils in them will continue to seep for some time. Grinding them makes a wonderful
rub for the first stage of zesting, allowing the grains to become embedded deep under the skin with enough rubbing.

--Liquid shoe polish is also an effective baste. While very painful when applied to tender areas of skin, it becomes unbearable
when coated onto the open wound. As with the pepper flakes, the burning sensation grows gradually, not ceasing for some time.