Boquerones en Vinagre — Spanish White Anchovies, Acid-Cured, Garlic-Parsley Finished

Before anything else: if you bought fresh anchovies at the fishmonger, freeze them at -20°C for at least 48 hours. This is what commercial boquerones producers across Spain do as standard practice — it eliminates any risk of anisakis parasite before the vinegar cure. If you bought them already frozen and thawed them, you can skip this step. Transfer the fish to the fridge 24 hours before you plan to start, so they thaw slowly and stay cold.

Decide your cure time before the fish goes in the vinegar — this changes the entire character of the dish. Two hours produces a semi-translucent result with a tender, yielding centre (the Andalusian bar style). Six to eight hours produces fully white, firmer flesh throughout — the most common tapas bar standard. Twelve to twenty-four hours gives a preserved, pickled result with maximum firmness. All are valid; choose before you start.

Clean the anchovies: pinch off the head and pull — the guts usually come with it. Open each fish flat by running your thumb along the backbone from head to tail end. The central spine lifts out cleanly from a fresh fish; pull it free from the tail end. You now have two fillets attached by the skin, butterflied open. Rinse briefly under cold running water and pat very dry with kitchen paper. If you prefer, separate the two fillets fully; either presentation works.

Arrange the cleaned anchovy fillets in a single layer in a non-reactive container — glass or ceramic, not metal. Combine the white wine vinegar, fine salt, and lemon juice (if using) and stir briefly. Pour over the fish. The fillets must be fully submerged; if they aren't, add a little more vinegar. Press a small piece of cling film directly onto the surface to keep the fish under the liquid, then cover and refrigerate.

Cure in the refrigerator for your chosen time (2 hours, 6–8 hours, or 12–24 hours). Check by holding a piece up to the light: the flesh must be uniformly white with absolutely no translucent or pinkish-grey areas. If you see any colour variation, return the fish to the vinegar for another hour. Do not rush this — serving under-cured boquerones with a translucent grey centre is the most common mistake.

When the cure is complete, drain the anchovies through a colander and rinse briefly but thoroughly under cold running water to remove excess vinegar. Pat very dry with kitchen paper — this step matters. Residual vinegar on the fish will make the final dish too sharp, and wet fish won't hold the olive oil properly.

Arrange the cured, dried anchovy fillets in a single layer on a flat serving dish, slightly overlapping is fine. Drizzle generously with extra-virgin olive oil — use the best you have, as it is one of the three primary flavours of the finished dish. Scatter the paper-thin garlic slices and the roughly chopped flat-leaf parsley over the top. Taste for salt and add a small pinch if needed.

Serve at room temperature, not straight from the fridge. Cold olive oil becomes thick and opaque and the flavour mutes noticeably — the dish is designed to be eaten at ambient temperature. Add the garlic and parsley only at the moment of serving; prepared in advance, the parsley wilts and the garlic becomes sharp and pungent. Boquerones dressed and ready to serve can sit at room temperature for up to 30 minutes. Stored under olive oil in the fridge without the garnish, they keep for up to 3 days.