01 - Scrub the oranges thoroughly under running water. Slice off the top and bottom of each orange to create flat ends. Score the peel into four vertical sections and carefully peel away the skin, keeping a thin layer of white pith attached for texture.
02 - Slice the peels into uniform strips approximately ¼ inch wide for even candying.
03 - Place the strips in a saucepan and cover with cold water. Bring to a rolling boil, then drain completely. Repeat this blanching process two additional times to draw out excess bitterness from the pith.
04 - Combine the granulated sugar and water in a clean saucepan. Stir over medium heat until the sugar fully dissolves and the mixture is clear.
05 - Add the blanched peels to the syrup. Simmer uncovered for 45 to 60 minutes, stirring occasionally, until the peels turn translucent and feel tender throughout.
06 - Using tongs, transfer the peels to a wire rack set over a sheet of parchment paper. Allow them to air-dry at room temperature for at least 2 hours, or ideally overnight, until the surface is no longer tacky.
07 - Place the chopped dark chocolate in a heatproof bowl set over a pot of barely simmering water. Stir gently and occasionally until completely smooth and glossy. Remove from heat.
08 - Dip each candied peel strip halfway into the melted chocolate, allowing the excess to drip back into the bowl. Arrange the dipped peels on a parchment-lined baking tray.
09 - Let the chocolate firm up at room temperature, or refrigerate the tray for 15 to 20 minutes to speed up setting. Once fully set, transfer to an airtight container and store in a cool, dry place for up to 2 weeks.