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1
Drain soaked cod thoroughly, pat dry with paper towels, and shred finely by hand, removing all bones and skin; set aside.
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2
Preheat oven to 160°C; heat 100ml oil in large shallow pan over medium-high heat, add potatoes in single layer, and fry until golden and crisp, approximately 8 minutes per side; drain on paper towels and season with fleur de sel.
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3
In same pan, add remaining oil and onion rings with bay leaf; cook over medium heat until deeply caramelised and soft, 12–15 minutes, stirring occasionally; season with salt and pepper.
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4
Return fried potatoes to pan with caramelised onions and shredded cod; toss gently to combine and heat through, 2 minutes.
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5
Pour beaten eggs over mixture and stir gently with wooden spoon over medium-low heat until eggs coat and set slightly, 3–4 minutes; do not fully scramble.
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6
Remove from heat; fold in olives and parsley carefully to avoid breaking potatoes.
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7
Transfer to warmed serving platter; season to taste with additional salt and pepper, and serve immediately with lemon wedges on the side.