"This smart all-in-one vegetarian main is perfect for entertaining on winter nights..."
INGREDIENTS
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4 large field mushrooms
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4 tbsp olive oil
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1 garlic clove, chopped
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about 400g/14oz spinach leaves
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a dusting of flour
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1 tbsp picked thyme leaves
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500g block all-butter puff pastry
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140g Stilton, sliced
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1 egg, beaten