The whole roe sac of grey mullet or tuna, salted and pressed and air-dried into a firm amber block. Grated over pasta it does what anchovy and parmesan do at once, and a small piece lasts months.
The intact ovary sac is removed carefully so the membrane stays unbroken, then salted, pressed flat under weights, and air-dried for weeks until firm and translucent. Grey mullet bottarga — bottarga di muggine, from Sardinia — is smaller, amber, and finer in flavour; tuna bottarga is larger, darker and more assertive. Japanese karasumi is the same product from mullet. Often sold coated in wax to slow drying. It slices and grates like a hard cheese and should be firm but not rock hard.
Salting followed by pressing and air-drying removes water and drops water activity below the threshold for spoilage, the same principle as any dry cure. Along the way, enzymes break proteins down into free amino acids — glutamate above all — and the roe's lipids concentrate and oxidise slightly into aromatic compounds, which is where the deep savoury intensity comes from. The result is one of the highest natural concentrations of glutamate in any food, which is why a small quantity transforms a dish. Heat drives off the volatile aromatics and can make it bitter, so it goes on at the end.
The classic Sardinian use, and the fat in the pasta carries the flavour while the heat is gentle enough not to scorch it.
HowSpaghetti with olive oil, garlic and chili, tossed off the heat, then bottarga grated generously over at the table. Nothing else, and no cheese.
Thin slices show the texture and the flavour is intense enough to stand alone.
HowSliced paper-thin with a sharp knife, with good olive oil, lemon and bread. Or on butter on toast.
It seasons anything mild, functioning as salt and savour in one.
HowGrated over soft-boiled eggs, steamed vegetables, avocado, or a plain risotto at the very end.
Same role — a concentrated savoury seasoning — but cleaner and less fishy.
HowGrated into a dressing, over a salad, or across roasted cauliflower. It dissolves into fat readily.
Bottarga is a seasoning with an extraordinary concentration of glutamate, and both common mistakes come from treating it as something else. Applied to real heat, the volatile aromatic compounds developed during curing simply evaporate and what's left turns bitter and faintly acrid — so it goes over a finished dish off the heat, never into a pan and never under a grill. The quantity error follows from the same misunderstanding: it's intense and salty enough that a tablespoon grated over pasta for two is a generous amount, and treating it as a protein rather than a condiment produces something overwhelming and, given the price, expensive to get wrong. Also don't add cheese to a bottarga pasta; both are doing the same job and they fight.
Grey mullet bottarga is finer and more expensive; tuna is larger, stronger and cheaper. Sardinian and Sicilian products are the benchmark, and Japanese karasumi is the same thing at a higher price. It should be firm with a slight give — rock-hard means over-dried and it will be bitter — and amber to deep orange, translucent when sliced thin. Whole lobes keep better than pre-grated, which loses aroma within days. Wrapped tightly it keeps months in the fridge and can be frozen. A single small lobe seasons many meals, which makes the sticker price less alarming than it looks.
Doneness: Never cooked. Grate or shave over finished dishes at the table. Store wrapped tightly in the fridge for several months, or frozen for longer. Bring to room temperature briefly before slicing so it doesn't crumble.
No dishes yet — this cut guide is new.
Mullet is the finer product — smaller lobes, amber colour, more delicate and complex, and considerably more expensive. Tuna bottarga is larger, darker, saltier and more aggressively fishy, and it's a reasonable place to start given the price difference. For grating over pasta, mullet is worth it. For general seasoning use, tuna does the job.
Historically because it was made from the roe of common fish by coastal communities who couldn't access sturgeon, and it kept without refrigeration. The name is now misleading — good mullet bottarga is expensive, though far less so than caviar, and it lasts months rather than days, which makes the cost per meal much lower.
For the savoury function, partly — both are concentrated glutamate seasonings and both dissolve into fat. Anchovy is oilier, softer and fishier; bottarga is drier, cleaner and has a distinct roe character. In a pasta where bottarga is the point, anchovy makes a different and still good dish. In a dressing or a sauce where it's a background note, they're reasonably interchangeable.