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Peel and slice thinly your onion and garlic cloves.
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In a large saucepan (I generally use one of my cast iron casseroles but a large saucepan is fine as well), warm up the olive oil and gently fry the onion and garlic for 5 to 10 minutes. Meanwhile cut your aubergine and red peppers into dice.
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Add the aubergine and red peppers to the saucepan, combine with the onion and garlic and leave to cook whilst you cut your courgettes into dice.
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Add the courgettes to the saucepan, combine with the other vegetables and leave to cook whilst you cut your tomatoes into dice.
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Add the tomatoes and, according to your taste, herbes de provences, thyme, a vegetable stock cube, tomato purée. Last time I made it I put thyme and a vegetable stock cube.
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Cover and cook over a very gentle heat for one hour stirring occasionally and then uncover and simmer uncovered for 30 minutes stirring occasionally (most of the water will be gone by the end).