Using a vegetable peeler remove the rind from the lemon or orange and julienne the rind into thin strips.
Add the strips to a 1/2 pint jar and then add the vodka.
Clean the rim and add the lids and rings. Store the jars in a dark cool place and shake the jar once a day for a month.
Before you use the extract make sure you shake the jar first but you should have a vibrant extract within six months. The extract will last indefinitely.