01 -
Wash the citrus under running water and trim the ends. Cut into consistent one-fifth-inch slices.
02 -
Remove large seeds gently. Combine two cups of sugar and two cups of water in a wide heavy pan.
03 -
Heat until the sugar dissolves and the syrup boils. Add a single layer of slices, using batches if necessary.
04 -
Reduce to a gentle simmer and turn carefully partway through. Begin checking around thirty minutes and continue until the rind is tender and fruit translucent.
05 -
Lift to a clean rack over a tray and drain about fifteen minutes. Coat with the reserved cup of sugar and return to the rack.
06 -
Let dry in a clean protected place, turning once, until the surface is no longer wet; this may take twelve to twenty-four hours. Refrigerate after drying and use within a few days, or freeze rather than relying on unverified long room-temperature storage.