01 - Wash the oranges thoroughly under running water. Using a sharp knife, score each peel from top to bottom into quarters. Gently remove the peel in sections, keeping as much of the white pith intact as possible.
02 - Slice the peels into uniform strips approximately ¼ inch wide.
03 - Place the peel strips in a saucepan, cover with cold water, and bring to a boil. Boil for 2 minutes, then drain completely. Repeat this blanching process two more times to remove excess bitterness.
04 - In the same saucepan, combine the sugar and water. Bring to a simmer over medium heat, stirring constantly until the sugar is fully dissolved.
05 - Add the blanched orange peels to the sugar syrup. Simmer gently for 40 minutes, stirring occasionally, until the peels become translucent and tender.
06 - Using tongs, carefully transfer the candied peels to a wire rack set over parchment paper. Allow them to dry for at least 1 hour until tacky but no longer wet.
07 - Melt the dark chocolate in a heatproof bowl set over gently simmering water (double boiler method), stirring until smooth. Alternatively, melt in short 20-second bursts in the microwave, stirring between intervals.
08 - Dip each candied orange peel strip halfway into the melted chocolate, allowing the excess to drip off. Place each piece onto parchment paper.
09 - Sprinkle with flaky sea salt if desired. Allow the chocolate to set completely at room temperature, approximately 30 minutes, before serving or storing.