Ossau-Iraty — Cups to Grams

Measuring Ossau-Iraty: Grated, Cubed, and Sliced

Ossau-Iraty is a compact semi-firm sheep cheese whose density increases with aging. A 3-month wheel is slightly softer and lighter when grated; a 6 to 9 month wheel is drier and grates into finer, denser shreds. The figures below reflect a mid-range aging of 4 to 6 months, which represents most retail-available wedges.

Grated (100g/cup): The standard form for cooking — gratins, tarts, and melted toppings. Grate on the coarse setting of a box grater. The paste of Ossau-Iraty is firm enough to grate without smearing, producing medium shreds that hold moderate air volume. Use immediately for best texture — the natural oils in sheep-milk cheese can cause shreds to clump within 30 minutes at room temperature.

Cubed half-inch (145g/cup): Dense, efficient packing produces the highest mass per cup. Cubing is used for cheese boards, salads (the cheese holds its shape unlike softer cheeses), and the traditional Basque board service alongside membrillo.

Sliced thin (120g/cup): Slices of approximately 3mm overlap when placed into a cup, leaving some air gaps. The traditional brebis-cerise presentation uses single thin slices plated alongside the cherry jam.

PDO Rules: Manech Sheep, Pyrenean Terroir, and Protected Origin

Ossau-Iraty's AOC/PDO specifications cover every stage from pasture to affinage. The milk must come from Manech Tete Rousse, Manech Tete Noire, or Basco-Bearnaise ewes — the three Pyrenean native breeds recognized by the INAO (Institut National de l'Origine et de la Qualite). These breeds are adapted to the Pyrenean pastures between 300 and 1800 meters altitude and graze from April to October on communal mountain pastures (estives) where wild thyme, gentian, and fescue grasses contribute subtle herbaceous notes to the milk.

Raw milk is mandatory for AOC Ossau-Iraty. Pasteurization is prohibited in the fermier (farmhouse) category. The milk is coagulated at 30 to 34°C using natural animal rennet (or plant rennet for vegetarian-labeled versions, though these are rare). After cutting, cooking, and pressing, the fresh wheels are salted in brine for 24 to 48 hours and then aged in humidity-controlled cellars at 6 to 12°C. The minimum aging is 60 days for small wheels (less than 3kg) and 90 days for large wheels.

There are two distinct wheel sizes: a small wheel (osau) of 2 to 3kg, and a large wheel (iraty) of 3 to 5kg. Both are cylindrical with slightly rounded sides. The PDO zone covers the entire Pyrenees-Atlantiques department plus several cantons of Hautes-Pyrenees, encompassing approximately 1,200 sheep farms and 20 dairies.

The Brebis-Cerise Tradition and Itxassou Jam

The pairing of fresh ewe cheese with Itxassou black cherries is one of the oldest documented gastronomic traditions of the Pays Basque. In the village of Itxassou in the Nive valley, three varieties of wild black cherry — Xapata, Beltza, and Peloa — grow on hillside orchards above 200 meters altitude. These cherries are smaller, more intensely flavored, and more acidic than standard sweet cherries. Their jam is cooked in open copper vats with minimal added sugar to preserve tartness.

The cheese-and-jam pairing works by contrast: the fat and protein of the sheep cheese coat the palate with rich, mild creaminess, and the tart jam cuts through the fat with acidity and fruit. A proper serving is 30 to 40g Ossau-Iraty (about one-quarter cup cubed) paired with 1 to 2 teaspoons of Itxassou jam per person. The combination is so central to Basque identity that a festival, the Fete du Fromage d'Ossau-Iraty, is held annually at the village of Laruns in the Ossau valley.

Nutritional Profile and Dietary Notes

Ossau-Iraty is a high-fat, high-protein sheep cheese. Per 100g: approximately 375 to 390 calories, 24 to 26g protein, 30 to 32g fat (of which 20g saturated), less than 0.5g carbohydrate, 700mg calcium, and 600 to 750mg sodium depending on brine duration. Sheep milk fat is higher in medium-chain fatty acids than cow milk, which some research associates with easier digestibility.

Per 1 cup grated (100g): approximately 380 calories, 25g protein, 31g fat. The caloric density is high — a one-quarter cup (25g) of grated Ossau-Iraty adds 95 calories and 6.25g protein to a dish. The cheese is virtually lactose-free in the aged form (less than 0.1g lactose per 100g), making it generally well-tolerated by those with lactose intolerance. It is not suitable for those with sheep-milk protein allergies, and its cross-reactivity with cow-milk allergy should be discussed with an allergist.