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["Melt 1 tablespoon of the butter in a large pan.", "Add the onion and leek and cook, covered, until soft but not browned.", "Add the cod and cook for 30 seconds.", "Add 1 cup of the cream, bring to a boil and remove from heat.", "Soften the gelatin in 2 tablespoons of tepid water.", "Add 2 tablespoons of the cream mixture, stirring constantly.", "Add the gelatin mixture to the cream mixture and stir until smooth.", "Puree in a blender with 1/2 teaspoon of salt, then pass through a chinois or fine-mesh sieve into a metal bowl set on ice.", "Refrigerate to set lightly.", "Whip 1 cup of cream until it forms soft peaks.", "Fold the cod mixture into the whipped cream to make a mousse.", "If the mixture becomes loose in the process, briefly whisk to restore texture.", "Refrigerate to set, about 2 hours.", "Puree the tomatoes in a food processor or blender, then push them through a fine-mesh sieve.", "In a pan over low heat, simmer them for 20 minutes, until reduced by half.", "Add the remaining 2 tablespoons of cream as well as the remaining 4 tablespoons of butter, diced, and 2 tablespoons of the olive oil.", "Season to taste and set aside.", "Bring the fish stock to a boil in a large pan.", "Immerse the langoustines in the stock for about 1 minute, turn and cook for another 30 seconds.", "Remove them with a slotted spoon.", "Reserve the stock for another purpose.", "Toss the greens with the remaining 2 tablespoons of oil and sprinkle with salt, pepper and lemon juice.", "To serve, place a small mound of the greens on each of 6 plates.", "Form the brandade into neat ""footballs"" about 1 inches long, using the bowls of 2 teaspoons as a mold.", "Place 6 of these and 6 langoustines on each plate.", "Spoon the sauce around them."]
