First make a brown stock.heat a pan add oil add onion and carrot make a brown add chicken bone make this also brown after that add celery, whole papercorn and bayleaf and ginger and salt..keep stiring until it's brown and add water

Make a chicken marination with chilli flakes..musterd paste and salt and soya sauce

After that Make a grilled chicken

Now make a sauce.Heat sauce pan Cook carrot and onion in butter in a 3-quart heavy saucepan over moderate heat, stirring occasionally, until golden, 7 to 8 minutes. Add flour and cook roux over moderately low heat, stirring constantly, until medium brown, 6 to 10 minutes. Add Brown stock in a fast stream, whisking constantly to prevent lumps once it's done add white paper powder and little bit salt..