This hearty butter bean gratin is packed with flavour. The addition of gooey feta and crispy sourdough breadcrumbs make it a seriously satisfying side dish.
Preheat the oven to gas 6, 200°C, fan 180°C. In a large pan, heat 2 tbsp of the olive oil. Add the onion and garlic and cook, over a low-medium heat, for 10 minutes, or until softened and golden.
Stir in the tomato purée, dill, vinegar, stock and beans. Bring to the boil, then carefully pour into a roasting dish.
In a bowl, mix the sourdough with the remaining oil, lemon zest and feta. Scatter it over the bean mixture and bake for 20 minutes, or until golden.
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