About this recipe

A single-pot bitter-orange marmalade with pronounced cognac and vanilla finish. A cold salt soak replaces traditional blanching to reduce bitterness without sacrificing aromatic oils.

Cognac is added in two stages — a small amount early with the sugar to embed oak and vanillin, the bulk off-heat with vanilla extract to preserve fresh grape-floral top notes. Flavour peaks at 3–4 weeks of rest.

Ingredients

3 kg organic oranges (bio, unwaxed)
2 lemons
1 L water (for maceration and cooking)
1½ tbsp fine sea salt (for the cold peel soak)
2.6 kg granulated sugar
¾ tsp citric acid
150 ml cognac (mid-range or better)
1 tbsp natural vanilla extract
½ tsp fine sea salt (for finishing)

About the cognac split: 35 ml goes in early (before sugar) to embed oak and caramel notes into the peel. The remaining 115 ml goes in off-heat at the end, together with the vanilla extract, to preserve the bright grape-floral top notes and the clean vanilla aroma. Use real vanilla extract — not synthetic essence — the ingredient list should read vanilla beans, alcohol, water (maybe sugar).

Equipment

One large non-reactive pot (stainless steel, minimum 6 L, ideally heavy-based)
Sharp knife
Muslin or cotton tea towel
Kitchen string
Citrus juicer
Wooden spoon
Candy thermometer (strongly recommended)
14 × 370 ml sterilized jars with new lids
3 small plates chilled in the freezer for set testing

Method

1. Juice and collect pips

Halve all the oranges and the 2 lemons across the equator. Juice them into a large non-reactive bowl. As you juice, scoop every pip and loose membrane into a square of muslin or clean cotton cloth. Reserve the juice. Tie the muslin bundle tightly with kitchen string once done — this is your pectin bomb.

2. Scrape the pith (~25 min)

Take each hollowed-out orange half and use a spoon to scrape out the thick white spongy pith from the inside, leaving only 2–3 mm of pith still attached to the coloured peel. Add the scraped pith to the muslin bundle (re-tie if needed). This removes the main bitterness load while keeping the pips' and membranes' pectin.

3. Slice the peel

Slice the scraped peel halves into strips — 3–4 mm thick, 3–4 cm long for classic chunky marmalade, or 2 mm for finer shreds.

4. Cold salt soak the peel (8-10 hours)

Put the sliced peel in a large non-reactive bowl. Dissolve 1½ tbsp fine salt in 1.5 L of cold water, pour over the peel. Cover and leave at room temperature. After 4–5 hours, drain, rinse briefly under cold water, and refill with fresh cold water (no salt this time). This draws out bitter compounds without heat damage to the aromatic oils.

5. Macerate juice and pip bundle overnight (8-10 hours)

In a smaller bowl (2-3 L) — small enough that the pip bundle is fully covered by liquid — combine the reserved juice, 1 L water, and the pip-and-pith muslin bundle. Check the bundle is submerged; if it floats, weight it down with a small saucer to keep it under the liquid. Cover. Leave at room temperature overnight alongside the salt-soaking peel. This extracts pectin from the pips, membranes, and scraped pith into the liquid — replacing what the salt soak might cost you.

Why less water: less maceration water means less to boil off in the first cook. With 2 L water, the first boil drags out to 2-3 hours; with 1 L, you stay in the normal 30-45 minute window.

6. Combine in the pot

Next morning: drain the peel well and rinse briefly. Transfer the peel and the macerated juice-water-pip-bundle mixture into your large pot.

7. First boil — soften the peel (30-45 min)

Bring to a gentle simmer. Cook uncovered at a gentle bubble for 30–45 minutes — shorter than a cold-start recipe because the peel is pre-softened by the salt soak and you're starting with less liquid. Peel should squash easily against the side of the pot.

8. Squeeze and discard the pip bundle (5 min)

Remove the pip bundle with tongs, cool 5 min, then squeeze HARD back over the pot — jelly-like pectin will ooze out. Squeeze until dry. Discard the bundle.

9. First cognac addition

Off heat: stir 35 ml of cognac into the pot. This embeds oak and caramel notes into the peel before sugar goes in.

10. Add sugar and citric acid, dissolve fully (3-5 min)

With the pot still off heat, add 2.6 kg sugar and ¾ tsp citric acid. Stir patiently with a wooden spoon until every sugar crystal has dissolved — no grittiness when you tilt the spoon. Rushing this burns the bottom.

11. Rolling boil to setting point (15-25 min)

Return to high heat and bring to a full rolling boil that doesn't stop when you stir. Boil hard 15–25 minutes, stirring occasionally. Skim foam as it rises. Start testing at 15 minutes: candy thermometer reading 105.5°C, OR wrinkle test on a frozen plate that holds shape for 45–60 seconds when pushed.

12. Second cognac addition + vanilla (1 min)

Once you hit setting point, kill the heat. Wait 60 seconds for the boil to subside completely, then stir in 115 ml cognac, 1 tbsp vanilla extract, and ½ tsp finishing salt. Adding vanilla off-heat preserves its full aroma — boiling vanilla extract for even 30 seconds strips most of its character.

13. Rest before jarring (8-10 min)

Let the pot rest undisturbed for 8–10 minutes. This lets the peel distribute evenly through the syrup instead of floating to the top of your jars. Give one gentle stir before jarring.

14. Jar, seal, invert

Ladle hot marmalade into warm sterilized jars, leaving 5 mm headspace. Wipe rims clean with a cloth dipped in hot water. Seal immediately with hot lids. Invert each jar for 2 minutes to sterilize the lid interior, then turn upright. Label with the date. Leave undisturbed 24 hours to set fully.

15. Check seals and store

After 24 hours, check every lid — it should not pop when pressed in the centre. Any unsealed jars go in the fridge to eat first. Sealed jars keep 12+ months in a cool dark pantry. Best flavour develops at 3-4 weeks of rest.

Notes & Troubleshooting

Why the cognac split (35/115)

The early 35 ml gets briefly cooked with the sugar, embedding oak and vanillin into the peel structure. The late 115 ml goes in off-heat to preserve the fresh grape-floral top notes. Net effect: layered cognac character, slightly reduced alcohol load on the pectin set.

Why vanilla extract, not pod

Extract goes in off-heat alongside the cognac — the alcohol bases are compatible and both preserve their volatile aromatics this way. A pod would need to steep during the first boil, which is more work and, for this recipe, no flavour advantage. Use real extract, not synthetic essence.

Temperature target

105.5°C for setting. A candy thermometer is worth the small investment — with ~5.7% booze load, eyeballing is risky. Aim for firm set rather than soft.

Agar agar variant (cuts total cook time)

If you want to significantly trim total time — or you've had setting failures before — you can replace the natural pectin route with agar agar. You skip (or shorten) the pip-bundle pectin extraction and get a guaranteed set regardless of how ripe or pectin-poor your peel was.

Quantity: 20–25 g agar agar powder for the full batch (final volume ~5 L). The marmalade is acidic, but it's also very sugar-heavy — sugar already adds body — so stay in the spreadable dose range (4–5 g/L), not the firm-jelly range.

Method:

Skip the pip bundle entirely, or shorten the first boil to 20 min (no need to squeeze the bundle hard — pectin is no longer doing the work).
At step 12, after you've added the second cognac and vanilla, scoop ~200 ml of hot liquid from the pot into a bowl and whisk the agar in until dissolved.
Pour the mixture back into the pot, return to medium heat, and simmer 2–3 minutes at a gentle boil, stirring constantly — agar needs to reach at least 90°C to activate.
Continue to step 13 (rest) and jar normally.

Texture difference: agar gives a firmer, more "cut" set than pectin. Closer to a French pâte de fruit than the soft wobble of a classic marmalade. Some prefer it, some don't — do a single test jar first to see whether you like it before committing the whole batch.

Check the package dose: brands vary (5–10 g/L for firm jellies, less for jams). If your package directs differently, follow it — agar agar isn't standardised.

If the set is sluggish

Past 25 min rolling boil, add juice of half a lemon and ½ tsp more citric acid, boil 3 more min. If still slow, accept a slightly looser set — overcooking kills flavour worse than soft set does.

Storage

Sealed jars: 12+ months in cool dark pantry. Flavour peaks at 3–4 weeks of rest as the cognac and vanilla integrate. After opening: refrigerate, use within 6 weeks.

Pairing ideas

Salted butter on sourdough (the default)
Goat cheese or aged sheep's milk cheese
Glazing roasted carrots or parsnips
Stirred into a bitter-orange vinaigrette with olive oil and Dijon
Spooned over yoghurt with black pepper
Folded into buttercream for a citrus cake filling

Green pancakes with lime butter