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1
Salt the quartered tomato segments lightly and leave them cut-side up for 10 minutes. Surface moisture will bead and retreat; the flesh will appear slightly contracted and more concentrated in colour. Meanwhile, soak the rinsed anchovy fillets in whole milk for 15 minutes, then drain and pat dry.
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2
Prepare the vinaigrette: combine the fleur de sel and red wine vinegar in a small bowl and stir until the salt dissolves. Whisk in the extra-virgin olive oil in a thin stream to form a loose emulsion. The dressing should appear briefly opaque and smell sharply of vinegar balanced by ripe oil.
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3
Rub the wide, flat serving plate firmly with the cut face of the garlic clove. A faint, warm garlic scent should rise from the surface — the plate is ready.
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4
Dress each raw vegetable component — tomatoes, paper-thin artichoke hearts, fava beans, radishes, bell pepper rings, spring onions, and celery — separately with a measured spoonful of vinaigrette. Each element must glisten individually and carry its own distinct seasoning before it touches the plate. This is where the dish lives or dies: components dressed together, or tossed in common, will bleed into one another and the composed structure collapses entirely.
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5
Arrange the dressed vegetables in deliberate, distinct zones across the flat plate — never overlapping groups, never mounded into a bowl. The composition should read as a map of separate flavour territories.
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6
Place the ventresca tuna, broken into generous flakes, and the drained anchovy fillets across the vegetables. Lay the quartered hard-boiled eggs — yolks set to a jammy, deep-gold centre — last, at the perimeter. Scatter the whole, unpitted Niçoise olives across the plate.
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7
Finish with torn basil leaves placed by hand. Hold the finished plate at cool ambient temperature, 14–16 °C, for a few minutes before service. The olive oil must flow freely when the plate is tilted slightly, and the tomato should release a faint, sweet volatile aroma at close range — not the flat, cold silence of refrigeration.