Yellow Onion (Cipolla)

The onion is the most widely used aromatic in Italian cooking. It forms the first layer of soffritto — the foundational flavour base of sauces, braises, and ragù — alongside garlic and celery. Unlike garlic, which adds sharpness, onion adds body and sweetness as it cooks down.

Varieties

Cipolla dorada (yellow/golden onion): The Italian kitchen standard. Versatile, available year-round, moderately pungent raw, sweet when cooked. This is the default in any recipe that simply says "cipolla."

Cipolla rossa (red onion): Milder, sweeter, slightly sharper finish. Used in salads and quick applications. Can substitute in pasta but produces a slightly different flavour profile.

Cipollotto (spring onion / scallion): Milder, used raw or barely cooked. Different application to standard cipolla.

Culinary Use

In Italian pasta with a soffritto base — such as pasta e tonno, amatriciana variants, and puttanesca — the onion is cooked slowly in oil for 5–8 minutes before other ingredients are added. The goal is translucency and softness, not browning. Browned onion changes the flavour character of the sauce from sweet to caramelised.

In pasta e tonno specifically: The onion provides the sweet, soft counterpart to the saline tuna. Without it, the dish is sharper and leaner. This is the structural distinction between pasta e tonno and aglio e olio with tuna added.

Cost Context

Yellow onions are among the cheapest ingredients in the Italian kitchen. At Italian supermarkets (Q1 2025), the average price is approximately €1.50/kg — a 1kg net is standard packaging at €1.30–1.80. An 80g portion (half a medium onion, sufficient for 4 pasta servings) costs approximately €0.12.