Simple as they seem, soups can be a real test of a cook’s palate and skill at combining flavours. This Tom Kerridge recipe is a great example, deceptively simple with only a handful of ingredients, the soup itself is the classic winter pairing of creamy celeriac and sharp cooking apples and is lovely by itself. Add some garnishes however and the resulting flavour combinations are eye-popping, every mouthful offers something different.
I have used pumpkin oil as a garnish here; it’s an unusual ingredient, and quite expensive – though it will go an awful long way. Use it like you would toasted sesame oil, as a seasoning and garnish, and it lifts anything it comes into contact with. A very worthwhile investment indeed.
This soup makes a delicious and filling supper meal, or a very elegant first course.
RECIPE – serves 4
1 litre vegetable stock
3 tbsp rapeseed oil
1 medium onion, finely chopped
2 large Bramley apples, or other sharp cooking apples
the juice of a lemon, freshly squeezed
200ml double cream
1/2 nutmeg, finely grated
To garnish (use any or all):
salty, soft blue cheese (Roquefort, dolcelatte or similar), crumbled
a few drops of pumpkin oil
Heat the oven to 180C/ 160C fan/ gas 4.
Peel the celeriac and retain the peel, chop the flesh into 2cm cubes and tip onto a roasting tray, drizzle a couple of tablespoons of rapeseed oil over it. Using your hands, ensure that every surface of every piece of celeriac has a fine film of oil, then spread the pieces out evenly across the roasting tray. Do not crowd your tray, leave a little space between each piece of vegetable and in a single layer, otherwise some pieces will steam rather than roast. Roasting drives out some of the moisture in the vegetable, intensifying the flavour in a way that steaming does not. The oil coating protects the vegetable from the dry heat and delays caramelisation until the vegetable is soft. Roast for 30-40 minutes until soft and just starting to brown.
Meanwhile, put the celeriac peel into the stock and bring to the boil. Turn off the heat and allow to infuse for at least 30 minutes.
Sweat the onion in 1 tbsp rapeseed oil with a little salt for around ten minutes until softened but not coloured – the salt will help as it encourages the moisture in the onions to be released.
Peel and dice the apples and toss them in a large bowl with the lemon juice. When the onion is soft, add the apples with the lemon juice and the roasted celeriac. Strain the infused stock into the pan and bring to the boil, simmer for ten minutes until the apple has started to break down. Add the cream, bring the temperature of the soup back up until it is just about to boil, then turn off the heat. Using a stick blender, or worktop blender, blitz the soup until it is smooth. Test and correct the seasoning, and grate in half a fresh nutmeg.
To serve, garnish with any or all of the garnishes listed.