Bottarga

Bottarga is a whole fish ovary, removed intact, packed in dry salt, pressed flat between boards and dried until it is solid enough to grate or shave. It comes as a single piece, usually two joined lobes, sold whole or already grated into jars.

There are two kinds and they are genuinely different products. Bottarga di muggine is grey mullet roe from Sardinia: amber to deep orange, roughly the size of a hand, delicate, with a clean sea flavour and a bitter-almond finish. Bottarga di tonno is bluefin tuna roe from Sicily: much larger, darker, meatier, considerably saltier, and roughly a third of the price. Recipes that just say bottarga almost always mean mullet.

The word came into Italian from Arabic butarikh, itself from Greek ōotárichon, salted eggs. The technique travelled the Mediterranean long before the word did, and the same product exists as karasumi in Japan and avgotaracho in Greece.

Salty first, then deeply savoury, then oddly floral. The salt is the front of the flavour, but what stays is a concentrated, slightly waxy shellfish-and-sea intensity, closer to the umami of aged cheese or anchovy than to anything fishy.

Mullet bottarga finishes with a distinct bitterness, like the skin of an almond, which is exactly what keeps it from being just salt. Tuna bottarga is heavier and closer to cured meat: more like a very dry, very savoury ham made of fish.

Grated over hot pasta with olive oil it stops tasting like a strong ingredient and starts tasting like seasoning, the way anchovy disappears into a sauce. Nobody's first reaction is that it tastes like fish eggs.

Never cook it. Heat turns bottarga bitter and burns off the aroma you paid for, so it goes in at the very end, off the flame.

For the classic spaghetti: warm a smashed garlic clove in good olive oil, add a ladle of pasta water to emulsify, toss in drained spaghetti, take the pan off the heat, and only then grate in 15–20 g of bottarga per person. Salt the pasta water very lightly: the bottarga brings all the salt the dish needs.

Shaved rather than grated, with a vegetable peeler, it is best raw: over thinly sliced raw artichoke with lemon, over fennel and orange, over celery, over burrata, over a soft-boiled egg. In Sardinia it is eaten simply, in slices, with butter and carasau flatbread.

A whole piece keeps its aroma far longer than a jar of pre-grated, so buy the block and grate to order.

Vacuum sealed and whole, a lobe keeps eight to twelve months in the fridge. Once you have cut into it, wrap it in greaseproof paper or foil and close it in an airtight box: three to four months is the usual window, and across it the roe dries slowly, firms up and tastes more concentrated. If the cut face hardens too much, a cloth barely wiped with oil brings the surface back.

Freezing is possible but costs structure, since the cold breaks the tissue and a thawed lobe crumbles instead of grating into clean ribbons. If you have to, freeze it already grated in small portions. An opened jar of grated bottarga goes back in the fridge and is generally given a month or two; after that the perfume is gone and what remains reads as salt. A dry whitish bloom on the surface is usually salt working its way out and comes off with a cloth. Damp or green growth, or a smell of ammonia, is a different change, and there the date on the pack and the shop that sold it are the reference.

A good mullet lobe is firm but not stone hard: press it with a thumb and it should give a little. The colour is even, amber to deep orange, with no blackened zones at the edges, which come from drying pushed too far or too fast, and the outer membrane should be whole and tight against the roe. The smell is clean sea with a bitter almond note behind it. Whole lobes arrive vacuum sealed or waxed, and Greek avgotaracho is the same fish handled the same way.

Tuna bottarga is the other thing on the shelf: darker, brick red to brown, coarser grained, saltier and blunter, and generally cheaper. Neither label is wrong, but they do not swap places in a bowl of pasta. Jars of ready grated bottarga need reading, because nothing requires them to be one hundred per cent mullet and the cheap ones blend species and offcuts. For the same money a whole lobe grated at the table beats a jar. Expect roughly $35 to $60 or £30 to £50 for an 80 to 100 g mullet lobe.

In the US, Italian specialists such as Gustiamo and Eataly stock Sardinian mullet bottarga, as do most serious Italian delis; Japanese and Korean groceries often carry karasumi, which is the same thing. Expect roughly $45–70 for a 100 g piece of mullet bottarga, less for tuna.

In the UK, Italian delicatessens and online grocers including Sous Chef and Natoora carry it, and it turns up in Waitrose's specialist range; London's Italian restaurant trade has kept a steady supply for decades. Budget £30–45 for 100 g.

Buy a whole piece rather than a jar wherever possible. Grated bottarga in jars is legally allowed to blend roe from more than one species, and it loses aroma within weeks of opening. Look for the species on the label (muggine or cefalo for mullet, tonno for tuna) and for vacuum packing with the roe sac visibly intact, evenly amber, with no blackened edges.

Cabras, on the Sinis peninsula in western Sardinia, is the centre of the mullet bottarga world: a brackish lagoon, cooperatives that have fished it for centuries, the Mont'e Prama giant statues in the town museum, and the Punic-Roman ruins of Tharros a few kilometres away. The town holds its own bottarga festival. Oristano and Alghero put it on every menu.

For tuna bottarga, head to Carloforte on the island of San Pietro, whose Ligurian-Tunisian community turned bluefin into a cuisine and whose Girotonno festival at the turn of May and June is the calendar event. In Sicily, the old Florio tuna works at Favignana is now a museum, and Marzamemi's tonnara still frames the village square.