Old-fashioned Chicken Pie

onion, chopped

carrot, chopped

stalk celery, chopped

sea salt and freshly milled black pepper

salt

 (7.5 ml) baking powder

cold butter, cut into blocks

(250 ml) grated Cheddar cheese

(5 ml)  dried mixed herbs

egg yolks

(125 ml) iced water

butter

large onion, finely chopped

stalks celery, finely chopped

large carrots, peeled and finely chopped

cake flour

reserved chicken stock

sea salt and freshly milled black pepper