Pare very thinly the bright-colored rind from the oranges (no white).
Blot the peel on paper towels to remove any excess oil.
Put peel in a 4 cup screw-top jar.
Add 2 cups vodka.
Store in a cool, dark place for 2 days or until the vodka has absorbed the flavor.
Remove peel and add remaining vodka.
Close jar and add remaining cup of vodka.
Close the jar and store in a cool dark place at least 1 month to age.