English Orange Marmalade

This is proper English orange marmalade, the kind that comes in a stoneware jar in British grandmothers’ kitchens. The three-citrus combination of oranges, grapefruit, and lemon is what gives this marmalade its classic bittersweet depth, where commercial single-orange jars usually taste flat. The 24-hour rest before cooking is what extracts the pectin needed for proper set.

The long soak is the technique most cooks skip and then wonder why their marmalade is runny. Citrus peels contain pectin, the natural gelling agent, but it’s locked inside the rinds. Slicing the fruit thin and letting it sit in water for 24 hours breaks down the cell walls and releases the pectin into the liquid. Without this rest, you’ll need to add commercial pectin or accept a soupy preserve.

Removing the pithy white inner portion is critical. The pith carries bitter compounds that are pleasant in small amounts but overwhelming in concentration. Cut the slices thin enough that you can flick out the pith with a knife tip; this is fussy work but it pays off.

The sheet test (juice sheets off a spoon in a wide drip rather than runs in droplets) is the foolproof way to know your marmalade has reached setting point. The temperature equivalent is 220°F (104°C); a candy thermometer makes this less guesswork.

Pro Tips

• Use Seville (bitter) oranges if you can find them in late winter. They’re the traditional choice and produce more complex flavor than sweet navels.
• Sterilize jars properly. Wash, then heat in a 250°F (120°C) oven for 30 minutes. Pour hot marmalade into hot jars to prevent thermal shock cracks.
• Pot the marmalade hot. It will be runny in the pan but sets up firmly in the jars after a day or two as it fully cools.
• Adds a tablespoon of Scotch whisky to the cooled batch for a properly English-Scottish twist.

Variations

• Add a knob of fresh ginger, grated, for a warming spice note.
• Substitute blood oranges for half the regular oranges for a stunning pink-red color.
• Stir in a teaspoon of vanilla extract or a split vanilla bean for a vanilla-orange marmalade.