Place the butter in a large saucepan over medium heat.
Sauté the onions until they have softened.
Add the celeriac and parsnips and give everything a good stir.
Add the stock.
Simmer over low-medium heat for about 30 minutes, or until the vegetables have softened.
Add the chestnuts and cook for a further 10 minutes.
Purée the soup, either in a blender or using a hand-help soup blender.
Return the soup to the saucepan and taste for seasoning.
Add some sea salt and freshly ground pepper to taste. If the soup is too thick, add some more stock or boiling water.
Serve with a dollop of crème frâiche and garnish with chives.
Kitchen Notes
BUYING CHESTNUTS I like to use chestnuts which have been pre-cooked and vacuum-sealed as they are readily available at my nearest supermarket. However, pre-cooked chestnuts which have been frozen or are sold in jars also work well in this recipe.
OVEN & STOVE TEMPERATURES All recipes on this website have been tested on an induction stove and/or with a conventional oven (i.e. an oven without fan). All recipes on this website use temperatures for a conventional oven, unless otherwise mentioned. Convection ovens (i.e. fan-forced ovens) are typically 20°C/70°F hotter than conventional ovens, but please check your manufacturer’s handbook.