Heat the butter and sugar in an ovenproof frying pan, about 20cm in diameter. Cook for 4-5 mins until the sugar is turning golden and caramelising, then turn off the heat. Cram the chicory, cut-side down, in the caramel. Roll out the pastry on a lightly floured surface and cut to fit the pan. Scatter the cheese over the chicory, then drape over the pastry, tucking it down at the sides. Bake for 25-30 mins until the pastry is golden brown. Leave to rest for 5 mins before
turning out onto a plate. Serve in slices with a side salad of winter leaves and walnuts.