bitter orange peel is from curacao oranges so you normally won't be able to make that yourself.
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The peel of Curaçao Oranges is actually green before it is dried; the skin doesn't ripen to orange. When dried, the peel actually looks mouldy, though it is not; it is greenish-greyish-blue on one side and white on the other.
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For sweet orange peel you can use fresh peel, but you'll have to use slightly more to account for water weight.