Peel your citrus fruit (I like to cut it into quarters first, so the peel doesn't come off in chunks), and thinly slice them. Put them into a medium-large saucepan, cover with water and bring to a boil. Cook for about 10 minutes.
Pour the peel out into a colander set over a bowl to catch the cooking liquid (if you have a large measuring cup/bowl, even better.. and if you forget, don't worry - just use water) and add about as much sugar as there is water. (ie if you have 2 cups cooking liquid, add 2 cups sugar.) Return everything to the pot, bring to a simmer and cook for about 30 minutes, or until the peel is very tender and almost translucent.
Drain (reserve the syrup for something tasty) and toss the strips in a shallow dish of sugar to coat. Place them on a piece of parchment or foil, or on a rack over a baking sheet to allow the air to circulate around them more. Leave them out for a day or so to dry out a bit, and then store in a sealed container. If you like, dip each strip in chocolate.