Tomato and Pesto Tart with a Walnut Crust

1. Preheat the oven to 200°C/400°F/gas mark 6.
2. Make the pastry: put the flour and salt into a bowl, pour in the oil and water, mix gently with a fork until it holds together, then stir in walnuts. Using your fingers press the mixture into a flan dish, covering the base as evenly as you can, and pushing up the sides a bit (high crust not needed). Put into the oven – no need to weigh down – and bake for 6–8 minutes. Remove from oven.
3. Meanwhile heat 1 tbsp of the olive oil in a pan, add the onions, cover and cook gently for 10–15 minutes until tender.
4. Drizzle the pesto over the pastry, then put the onions in an even layer. Arrange the sliced tomatoes on top, slightly overlapping, to cover the tart completely. Sprinkle with some salt, grind some black pepper over and drizzle with the remaining olive oil.
5. Put the tart back in the oven and bake for 8–10 minutes to cook the tomatoes a little. Scatter with torn basil leaves and serve.

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