Homemade orange and lemon zests without a grater/ zester

I have been making fruit juice on a daily basis.  However, I have been throwing away the pulps from the juice into the bin bag because I have no garden to turn this green waste into compost.

There are several obvious solutions.  One of them is to use them to make muffins.  However, I discourage myself from eating too many muffins.  

Another solution is to dry the skins in the oven.  If I need to use lemon/ orange zest in my recipe, I'll just chop the dried lemon/orange skins into small pieces.  I dried the skins in the oven today.  Voilà!

slices of dried orange skin

slices of dried lemon skin