Celery and Potato Soup for 4

Scaled to serve 1

12.5 g of margarineheattosssimmer 30minblend
112.5 g of celerycut into 1.5cm pieces
68.8 g of potatoespeeled, cut into 2.5cm cubes
225.0 ml of chicken stock
0.2 bouquet garni
0.2 salt and pepper