A good blueprint for making gratins. It’s a rich dish, so it needs a green vegetable served on the side. You can add other vegetables – blanched fennel, fried aubergines or courgettes, braised leeks – layering them between the tomatoes and the beans. Prep time: 15 minutes | Cooking time: 1 hour 20 minutes Six © Telegraph Media Group Limited 2020 We rely on advertising to help fund our award-winning journalism.
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