Bocadillo de Gambas

The cook's first move decides which sandwich this is, because the name covers two. Reach for the plancha and the prawns go onto screaming-hot steel, shell-on or peeled, and sear in seconds until the flesh turns from glassy to opaque and the edges catch a little char. Reach instead for a pan of olive oil, sliced garlic, and a piece of dried chili, and the peeled prawns poach-fry in that oil al ajillo until they curl and set, the oil itself turning gold and sharp with garlic. Same shellfish, same loaf, two sandwiches that share almost nothing on the tongue.

Where the chorizo or the courgette is everyday, a prawn bocadillo is a small luxury, and the cooking respects that. Nobody makes it for anything but the prawn, sweet and briny and faintly of the sea, so both methods are about getting it to the bread at the exact instant it firms and no later. The grilled route plays up the char and the clean smoke; the garlic route plays up the oil, spooned hot over the crumb so the bread carries the garlic and chili the prawns cooked in. Neither hides the shellfish behind much, because there is no point paying for prawns and then burying them.

The shellfish punishes a second of inattention either way. Hold the prawns on the heat a moment too long and they seize into tight, dry, rubbery commas, the sweetness cooked out and the texture gone to elastic; this is the one mistake that empties the whole sandwich, since a tough cold prawn is exactly what it was not supposed to be. The bread fails on the other side: the al ajillo oil and the prawns' own moisture soak fast, so a crustless roll goes slack and greasy, while a plancha prawn left to sit steams the loaf soft from the inside. The save is a barra with crust enough to stand against it, and prawns pulled the instant they turn.

The two readings smell and eat like different things. The grilled one reaches you as hot shell and scorched edge, a whiff of the sea and the steel, then the prawn snapping firm and sweet with a smoky rim, a wedge of lemon cutting across it. It eats clean, brine and char held in the hand. The garlic one reaches you as frying garlic and warm oil first, then prawns slick and tender, the crumb beneath them soaked gold and carrying garlic and a low chili burn, the lemon lifting the richness, the oil running at the wrist.

Because the two diverge so far, the garlic-prawn build is treated as its own bocadillo rather than flattened in with the grilled one, and the rest is small accents. A smear of alioli deepens the garlic side; a little parsley folded through the al ajillo oil brightens it; some hands add a touch of chili or a few drops of sherry. Its close coastal neighbour is the fried-squid bocadillo de calamares, the same fry-counter and beach-bar world built on a different shellfish, and the gambas a la gabardina, prawns in a puffed batter, take the prawn somewhere else again. Each is its own sandwich, not a version of this one.

The Cazuela and the Beach Bar

The prawn bocadillo has no named creator and no first making; it is coastal bar food that takes shape wherever cheap prawns, a hot surface, and bread meet, and any account that hands it a creator has invented a person to fill a blank. What can be placed is the two tapas the sandwich loads into bread, each with a documented home in Spanish bar cooking, because the bocadillo is really one of those tapas given a loaf to walk away with.

Gambas al ajillo belongs to the cazuela, the shallow earthenware dish that holds heat and arrives at the table still spitting.

It is a fixture of the central and southern taberna, cooked in olive oil with garlic and chili and brought out audibly sizzling, and it grew into a national tapas-bar staple over the twentieth century as the standing bar meal spread across the country. The garlic-prawn bocadillo is that cazuela tipped into a barra, oil and all.

The grilled prawn lives somewhere else entirely, at the chiringuito, the beach bar of the Mediterranean and Andalusian coasts, where prawns and other shellfish go straight onto a flat grill over the sand and come off charred and salty. On a hot afternoon those grills run nonstop, the prawns landing on the steel in batches and the smoke drifting down the beach, and a fistful of them folded hot into bread with a squeeze of lemon is the version the coast eats with its feet still sandy.