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1
Salt aubergine cubes generously; spread on a paper-towel-lined tray; rest 15 minutes to release moisture; pat dry thoroughly.
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2
Heat 50 ml olive oil in a large frying pan over medium-high heat; working in batches, fry aubergine until golden on all sides (approximately 4 minutes per batch); transfer to paper towels.
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3
In the same pan, heat remaining 50 ml olive oil; sauté onion, celery, and red pepper over medium heat until soft and translucent (5 minutes).
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4
Add crushed tomatoes and bay leaf; simmer 5 minutes; return aubergine to pan; fold in olives, raisins, pine nuts, capers, and season with fine sea salt and black pepper.
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5
Combine red wine vinegar and caster sugar in a small bowl; pour into the pan; simmer gently for 10 minutes, stirring occasionally, until vegetables are tender and liquid reduces slightly.
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6
Remove from heat; discard bay leaf; tear and fold in fresh basil; taste and adjust seasoning.
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7
Transfer to a serving dish; cool to room temperature (flavour develops as it cools). Serve at room temperature as a side dish, antipasto, or condiment. Keeps refrigerated for 5 days.