Conservas are tinned seafood: fish and shellfish preserved in olive oil, sauce, or brine. The word is Spanish and Portuguese, and one tin is a conserva. The tradition dates to the 1800s along the Galician and Portuguese coasts, where good tins are still treated as a delicacy.

Canning was invented in France in the early 1800s as a way to feed armies and ships, and the first sardine cannery opened in Nantes in 1824. Galicia came later. When French sardine stocks collapsed in the 1880s, the industry moved to Spain's northwest coast and never left.

Preserved, not fresh. The distinction matters less than it sounds. Sardines and mackerel are typically canned within a day of landing, often at canneries on the same stretch of coast, while fish at a fresh counter can spend a week in transit.

No. Everything arrives ready to eat, straight from the tin. Some are cooked in the tin, others cured or smoked, but none of it needs heat. If a tin has been in the fridge, let it sit out twenty minutes first. Cold oil mutes the flavor.

Oil-packed sardines or a Spanish tuna. Familiar enough to feel safe, different enough to show why people care. Toast, lemon, flaky salt, done. If you'd rather not guess, our Perfect Tin quiz will point you to a specific tin in about a minute.