Quick asparagus and taleggio tart

Method

1. Preheat the oven to 200°C/fan180°C/gas 6. Heat a little olive oil in a frying pan, then gently fry the shallots for 5 minutes until soft but not coloured.
2. Bring a medium pan of water to the boil, then blanch the asparagus tips for 2 minutes until bright green. Drain and refresh under ice-cold water, then slice in half lengthways and set aside.
3. On a lightly floured surface, roll out the puff pastry to the thickness of a pound coin, then divide into 2 x 15cm squares and transfer to a lined baking sheet. Score a 1cm border around the inside of each pastry square, then spoon the mustard into the middle and spread up to the border. Top each tart with 4 taleggio slices, the asparagus spears, shallots and parmesan.
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4. Brush the pastry edges with the beaten egg yolk, season with sea salt and black pepper, then bake for 20 minutes or until golden and bubbling. Serve with salad leaves.