Preparation
Knead the flour, 1/2 tsp salt, the butter, cut into small pieces and the egg quickly into a smooth dough (if necessary add 1-2 tbsp cold water). Shape into a ball and wrap in cling film. Chill in the fridge for 1 hour.
Roll out the pastry on a floured surface to a round, slightly larger than the baking tin.
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Lightly fold the dough.
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Place the pastry in the greased tin to line the base and sides.
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Preheat the oven to 180°C (160°C fan, gas 4).
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Wash the leeks, cut into rings and blanch in boiling salted water for 2-3 minutes. Rinse in ice cold water, then drain well.
Scatter over the pastry base. Whisk together the eggs and cream, season with salt, pepper and nutmeg and pour over the leeks.
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Wash and halve the cherry tomatoes, then place them on the tart, cut side up. Bake in the oven for 30 minutes. Sprinkle with basil and serve in slices.
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