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Cut the aubergine in half lengthwise and steam over a pan of boiling water for about 20 minutes till soft
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Allow to cool slightly, then chop into chunks and tear the mint into the aubergine, mixing well
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Top and tail the courgettes, then using a potato peeler, slice the courgettes into ribbons
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Cut the fish and tomato (if fresh) into chunks
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In one pan soften the garlic and seal the tuna, then stir through the tomato and aubergine and allow to rest while you cook the courgettes
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In a largish non-stick frying pan, heat a teaspoon of olive oil, then gently soften the courgettes over a moderate heat till they start to go translucent.
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Stir through the sauce, season with salt, pepper and lemon juice to taste and tear in the basil leaves
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Serve!