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1
Prepare the lard-baste in advance. Work the softened saindoux together with the salt, black pepper, and piment d'Espelette until uniform. Roll the mixture into a cylinder, wrap tightly, and refrigerate until firm. When firm, slice into small discs, one disc per snail. The baste is ready when each disc holds its shape cleanly.
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2
Build the fire from sarments — vine prunings only. No other fuel is acceptable; the smoke of dried vine wood gives the cargolade its specific character. Burn the sarments down to a bed of white-hot embers. The fire is ready when the embers glow uniformly white and no flame remains.
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3
Set the grelhada (a circular wire rack of at least 60 cm diameter, with raised edges) over the white embers. Arrange the live petit-gris snails on the rack shell-opening upward — this is where the dish lives or dies: opening upward retains the snail's own juices inside the shell, which become the first cooking medium; placed opening-down, those juices drain away entirely and the snail dries out. Pack the snails closely; the rack should hold 200 or more at a time.
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4
Grill for 5–7 minutes without intervention. The snails retract into their shells and begin to cook in their own liquor. The moment is correct when liquid visibly bubbles at the opening of each shell.
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5
Working quickly across the rack, place one disc of the lard-baste onto the opening of each shell. The lard melts from the heat of the shell and the embers, running into the cavity and basting the snail in seasoned fat. Continue grilling for a further 3–4 minutes. The snail is done when the lard disc has melted entirely through and the flesh, extracted with a toothpick, is firm but yields without resistance.
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6
Eat each snail directly from the shell: pick up the shell using a piece of pa amb tomàquet, extract the snail with a toothpick or small fork, dip in aioli if desired. The bread catches the seasoned fat that drips from the shell. Return to the fire for the next batch. The cargolade continues — at this pace, unhurried — for three hours or more.