Marmalade is the princess of preserved fruits. While most jams more closely resemble hardy farmhands inured to careless treatment, marmalade lays swathed in cashmere blankets on the terrace of a Swiss sanatorium, coughing palely and demanding a proper fish fork for her boiled dinner.
Instead of tossing some fruit in a pot with sugar and checking in every half hour or so, I started this recipe by peeling away the rind from my fruit and selecting only the most plump and flawless pieces, discarding about 2/3. Carefully I sliced the chosen pieces into thin strips, which I then boiled until soft (about half an hour). A recipe I consulted recommended replacing the water every ten minutes, but I was cooking three other dishes concurrently and hadn't the time.
Then I took the reserved fruit pulp and boiled it for about half an hour before using a sieve to extract the juice. To seal the deal, toss the strips in the juice and add a bit of sugar--I started with three Seville oranges and three sweet limes, which made one cup of (dry) strips and two cups of juice, to which I added about a half cup of sugar.
Boil down until it passes the freezer plate test and process, quickly and cleanly, so as not to kill your friends with botulism.