Why Olive Oil? The Story Behind Conservas' Favorite Preserving Medium

Pop the lid on almost any conservas tin and the first thing that hits you, right after that briny hello, is the oil. Golden, glossy, pooling around the fish like it's the main event and not just packing material. That's because in the world of tinned seafood, it kind of is. Olive oil is a preservation method with centuries of history behind it, a flavor delivery system, and often the reason a $9 tin can taste more complex than food costing five times as much.

Ready to actually understand what's happening inside your tin? Here's where oil-packed conservas came from, why olive oil changes the fish inside more than any other packing liquid, and four tins from the In Olive Oil collection worth cracking open tonight.

A Closer Look at the Oil

Where the Practice Comes From

Fishing communities along the Mediterranean were salting, pickling, and oil-packing their catch long before anyone thought to seal it in metal. Olive oil was the obvious choice for coastal Spain, Portugal, and southern France simply because it was already there, pressed from the same hillsides overlooking the water. The tin itself came later, out of necessity rather than craft: in the early 1800s, with Napoleon's army needing food that could survive a long march, a French confectioner named Nicolas Appert discovered that sealing cooked food and heating it kept it edible for weeks. That method (described as "Lata" in Spanish) crossed into Iberia, and in 1853, Portugal's first commercial cannery opened in Setúbal, packing sardines in olive oil. Pasteurization followed in 1862, and within a few decades, hundreds of canneries lined the coast.

What started as a practical solution to a spoilage problem turned into a genuine culinary tradition. European gourmets have spent decades seeking out specific vintage-dated tins the way collectors seek out aged wine, letting sardines sit for a year or more before opening them on purpose.

Why the Oil Changes the Flavor

Fat carries flavor better than almost anything else in cooking, and olive oil is doing that job from the moment the tin is sealed. It cooks the fish gently and evenly, then keeps working long after processing is done. Over weeks and months in the tin, the oil softens the fish's sharper marine notes while picking up richness in return, so the two genuinely become one dish rather than a fish sitting in a liquid.

Plenty of producers take this further by infusing the packing oil itself before sealing it. That's the reasoning behind tins like Ar De Arte's scallops in garlic and chili olive oil, where the aromatics steep directly into the oil during processing, or Ati Manel's sardines packed with lemon, where the citrus mellows into the oil instead of sitting on top of it. In both cases, the oil stops being a neutral preserving medium and becomes a flavor built into the tin, not something added after the fact.

Quick Ways to Use It

• Mop it up with bread. The simplest use is still the best one. A crusty piece of bread pulls double duty as delivery vehicle and reason to finish the tin.
• Whisk it into a vinaigrette. Swap it in for plain olive oil in a basic dressing. Flavored oils like garlic-chili or lemon need little else besides an acid and a pinch of salt.
• Finish a bowl of pasta with it. Toss hot pasta directly in the oil straight from the tin instead of reaching for a separate bottle.
• Spoon it over roasted vegetables. A few minutes out of the oven, still warm, is when infused oils show up the most.
• Use it as a base for a quick aioli. A flavored oil skips a step you'd otherwise have to build from scratch.

Four Tins We're Currently Loving

A softer Spanish oil, a spicy American surprise, a bright Portuguese classic, and one built for the bread-sopping ritual

Olasagasti

Yellowfin Tuna Loin in EVOO

Olasagasti has been packing tuna along Spain's Basque coast for 125 years, and this loin shows why that kind of experience matters. Extra virgin olive oil brings a noticeably fruitier flavor than standard olive oil, and it's gentle enough here to let the tuna's natural sweetness and velvety texture come through instead of getting buried.

$11.99 SHOP NOW

Island Creek

Littleneck Clams w/ Confit Garlic, Chili & Olive Oil

Littleneck Clams with Confit Garlic, Chili, and Olive Oil from Island Creek feature tender, flavorful clams sourced from Cape Charles, VA, and New Bedford, MA. This tin offers perfectly pliable clams with a balance of rich garlic and serious heat from chili de árbol.

$21.99 SHOP NOW

Ati Manel

Sardines in Olive Oil & Lemon

This Portuguese tin adds bright lemon to the mix, cutting through the richness of the oil and the sardines both. It's a good entry point if you're newer to sardines in oil. The citrus keeps things lively instead of heavy, and it's built for weeknight use on toast, tossed through pasta, or straight over greens.

$8.49 SHOP NOW

Ati Manel

Horse Mackerel

This tin from Ati Manel combines these small fish with a lovely olive oil and basil sauce that make finishing a whole tin to yourself quite an easy endeavor.

$8.49 SHOP NOW