Celery and Potato Soup for 4

Scaled to serve 2

25.0 g of margarineheattosssimmer 30minblend
225.0 g of celerycut into 1.5cm pieces
137.5 g of potatoespeeled, cut into 2.5cm cubes
450.0 ml of chicken stock
0.5 bouquet garni
0.5 salt and pepper