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Heat oven to 200C/180C fan/gas 6. On a lightly floured surface, roll the pastry out to slightly smaller than an A4 rectangle. Slide onto a baking tray, brush with the beaten egg and cook for 20 mins or until golden.
Meanwhile, melt the butter in a frying pan over a medium heat. Once foaming, add the onions with a pinch of salt. Cook, stirring regularly, for 10 mins until soft. Pour in the balsamic and cook for a further 6-8 mins until sticky and caramelised.
Spoon over the pastry, then top with the courgette ribbons and blobs of goat’s cheese. Return to the oven for 15 mins until the cheese is bubbling. Serve with salad.