Can I use black rice vinegar for sushi rice? (Chinkiang Vinegar)  What is the difference to white rice vinegar when making sushi?  Should I still add sugar and salt? 
It is perfectly safe to eat the peel in and of itself. You will need to make sure that you wash it properly, as it may be dirty. But beyond that, it's simply a matter of taste. A lot of people don't like the flavor / texture of the peel and so remove it.   From a site devoted to kiwis:     Kiwi fruit skin is definitely edible,   and there's a lot of different   theories about eating it.      Kiwi fruit skin contains high levels   of flavonoids, insoluble fiber and   antioxidants: these substances all   have a beneficial effect on your   body's metabolic functions (flavonoids   and antioxidants) and on your   digestive system and cardiovascular   apparatus (insoluble fiber).      Common sense, however, should be   practiced in this respect: while raw   kiwi fruit skin contains these   beneficial substances, it also tends   to contain more than 99,95% of of the   pesticides in that particular fruit   (if they have been used), which   largely outweighs the benefits from   flavonoids and antioxidants.  