Caponata Siciliana (Sweet-Sour Aubergine Relish) with Crostini

Sicilian caponata sits somewhere between a relish, vegetable stew and antipasti, with aubergine at its centre and a distinctive agrodolce sweet-sour finish. Here the aubergine is roasted until golden rather than fried, giving it a tender, concentrated texture before it is folded through a tomato base with softened celery, red onion, garlic, capers and green olives. Red wine vinegar and a little sugar sharpen and round the sauce, so the finished dish tastes savoury, tangy and gently sweet. Serve it warm or at room temperature with crisp crostini for a simple lunch, starter or sharing plate.
Cuisine style Sicilian antipasto
Cooking style Make-ahead friendly • Crowd-friendly
Time commitment Under 1 hour

Why this recipe works

  • Balanced agrodolce flavour: Red wine vinegar and a little sugar give the relish its characteristic sweet-sour finish without overpowering the vegetables.
  • Soft relish, crisp bread: Tender aubergine and a thick tomato base contrast well with crunchy crostini, making each bite more satisfying.
  • Briny depth: Capers and green olives add saltiness and complexity, balancing the sweetness of the onion, tomato and roasted aubergine.
  • Improves as it rests: A short standing time lets the vinegar, tomato and olive oil settle into a rounder, more cohesive flavour.

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Authenticity notes

  • Sicilian agrodolce style: Caponata is closely associated with Sicily and is recognised for its sweet-sour seasoning, usually balanced with vinegar and a little sugar.
  • Served warm or room temperature: It is commonly served as an antipasto or vegetable side rather than eaten straight from the pan, as resting helps the flavours settle.

Timing notes

  • Let it stand before serving: Resting the caponata after cooking softens the sharpness of the vinegar and helps the sweet, savoury and briny flavours come together.
  • Best serving temperature: Serve it warm or at room temperature, but toast the bread close to serving so the crostini stay crisp.

Ingredient notes

  • Choose firm aubergines: Firm, glossy aubergines hold their shape better and give a cleaner texture once roasted and folded into the sauce.
  • Balance the vinegar carefully: Taste after adding the vinegar and sugar; the finish should be lively and sweet-sour, not harsh or sugary.
  • Use sturdy bread: Slightly stale crusty bread or sourdough makes better crostini because it toasts firmly and holds up under the relish.

Make-ahead tips

  • Make the caponata in advance: Cook the relish ahead and refrigerate it once cool; the flavour often becomes rounder after resting.
  • Reheat gently: Warm it slowly in a saucepan over a low heat until piping hot, adding a small splash of water only if the sauce has thickened too much.
  • Freeze the relish only: Freeze the caponata without the crostini, then defrost overnight in the fridge before reheating or bringing back to room temperature.

Equipment you'll need

Ingredients
Instructions
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  1. Heat the oven to 200°C (390°F). Cut the aubergine into 2 cm cubes and toss with 3 tbsp of the olive oil on a baking tray. Roast for 20 minutes, turning once, until deeply golden and tender.
  2. Meanwhile, finely slice the red onion and thinly slice the celery. Warm the remaining 2 tbsp olive oil in a large frying pan over a medium heat, then cook the onion and celery for 8 to 10 minutes until softened and lightly golden. Add the garlic and cook for 1 minute until fragrant.
  3. Stir in the capers and green olives, then add the canned tomatoes. Simmer gently for 10 minutes, stirring occasionally, until the sauce thickens slightly and the celery is tender. Fold in the roasted aubergine and simmer for 2 minutes to bring everything together.
  4. Stir the red wine vinegar and caster sugar into the pan and cook for 1 minute, tasting for a balanced sweet-sour flavour. Take off the heat and leave to stand for 10 minutes so the flavours settle. Serve warm or at room temperature.
  5. Toast the crusty white bread until crisp and golden, either in the oven for 6 to 8 minutes or in a dry frying pan. Spoon the caponata into a bowl and serve with the crostini alongside. If you like, drizzle a little extra olive oil over the top just before serving.

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Recipe notes

Tips

  • For the best texture, roast the aubergine until well browned; pale aubergine can taste spongy in the finished caponata.
  • If serving at room temperature, give the caponata at least 20 minutes to sit after cooking so the agrodolce flavour rounds out.
  • If you are cooking for anyone vulnerable to foodborne illness, make sure the caponata is served piping hot rather than left standing for long periods.

Substitutions

  • Replace red wine vinegar with white wine vinegar for a slightly lighter, cleaner acidity.
  • Replace caster sugar with light brown sugar for a deeper, more caramel-like sweetness.
  • Replace crusty white bread with sourdough bread for sturdier crostini.

Storage

  • Refrigerate up to 4 days
  • Cool completely, then refrigerate in a sealed container. Reheat gently in a saucepan over a low heat until piping hot, or serve at room temperature; toast the crusty white bread fresh for best crunch. Freeze the caponata only (not the crostini) for up to 2 months and defrost overnight in the fridge before reheating.

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Caponata Siciliana (Sweet-Sour Aubergine Relish) with Crostini
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Recipe overview

  • Servings: 2 servings
  • Total time: 50min (25min active)
  • Difficulty: Medium
  • Cuisine: Italian
  • Allergens:
    Gluten Wheat
Freezer friendly Kid friendly

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