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1
Heat 60ml oil in a large, heavy-bottomed pot over medium heat; soften onion and eggplant for 8 minutes, stirring occasionally.
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2
Add zucchini and bell peppers; cook 8 minutes, stirring gently, until all vegetables are beginning to yield.
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3
Stir in minced garlic and herbes de Provence; cook 2 minutes until fragrant.
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4
Pour in canned tomatoes with their juice, add bay leaf, and bring to a gentle simmer; cook uncovered 20 minutes, stirring occasionally, until vegetables are very tender and sauce is thick.
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5
Add fresh basil and stir gently; season carefully with coarse salt and Aleppo pepper.
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6
Remove from heat, discard bay leaf, and finish with best-quality extra-virgin olive oil.
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7
Serve warm or at room temperature; ratatouille improves over 1–2 days as flavours meld.