
Bright, bittersweet, and deeply aromatic, this classic citrus preserve is the kind of thing that makes a plain piece of toast feel like a special occasion. For anyone managing a nickel sensitivity, homemade marmalade is a genuinely smart choice — store-bought spreads and jams can hide surprising ingredients, but this one is built from just four things: fresh oranges, lemons, water, and sugar, all of which are naturally low in nickel. The technique here is more approachable than it looks, relying on the natural pectin locked inside the pith and seeds to create a beautiful, glossy set without any additives or thickeners. Slicing the peel into thin strips gives you that signature jewel-like texture, and the frozen-plate test takes all the guesswork out of knowing when it's ready. The result is a vibrant, tangy-sweet spread with real depth of flavor — far better than anything you'd pull off a grocery shelf. Sealed properly in a water bath, you'll have jars ready to gift, stack in the pantry, or slather generously on warm toast for weeks to come.
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Halve all the oranges and lemons. Squeeze the juice from each half into a large heavy-bottomed pot (at least 8-quart), catching the seeds and any loose pulp in a fine-mesh strainer set over the pot. Transfer the seeds and strained pulp to a double layer of cheesecloth; set the squeezed halves aside.
Using a spoon, scrape the white pith and any remaining pulp from the inside of each squeezed orange and lemon half and add it to the cheesecloth bundle — this pith is rich in natural pectin and is essential for the set. Tie the cheesecloth into a secure bundle with kitchen twine, leaving a long tail to tie to the pot handle.
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