Heat the oven to 200C/180C Fan. Melt the butter in a frying pan and gently cook the shallots, with the lid on for 10 minutes. Add the sugar and vinegar and turn up the heat. Cook stirring occasionally for 5 minutes so that the shallots caramelised. Set aside to cool.
In a large bowl combine the flour, salt and baking powder then stir in 50g of the cheese and the shallots.
Make a well in the centre of the flour and pour in the buttermilk. Splay your fingers out like a big fork and mix gently but quickly to combine to a dough. To get the lightest bread, minimise the amount you handle the dough. ;margin-bk�V�V�k