Low-Fat Pumpkin Soup: 3 g of Fat a Serving, Still Velvety

Low-Fat Pumpkin Soup: 3 g of Fat a Serving, Still Velvety

Most pumpkin soup recipes solve the same problem the same way. The squash is sweated in butter, simmered in stock, blended, and then finished with a generous pour of double cream, because without it the soup tastes thin and watery. That finish is where nearly all the fat lives — around 25 g a bowl once the butter and cream are counted.

But the thing cream adds here is not richness so much as body. A soup feels velvety when it is thick enough to coat the spoon and smooth enough to have no grain in it. Both of those are texture problems, and texture can be built out of the vegetable itself. This version gets there with a hot dry oven, one floury potato and a spoonful of thick yogurt stirred in at the very end.

Fat: 3 g  ·  Saturated fat: 0.5 g  ·  Serves: 6  ·  170 kcal  ·  Prep: 15 min  ·  Cook: 45 min

Why This Version Works

Roast the squash, do not sweat it. Twenty-five minutes at 220°C fan does two things a buttered pan cannot. It drives off a surprising amount of water, which means the purée that follows is concentrated rather than diluted, and it browns the cut surfaces, which builds the deep, faintly caramel flavour people usually try to add back with cream and sugar.

One floury potato does the thickening. As it cooks, its starch granules swell and burst, and that starch holds the purée in suspension so the soup stays glossy instead of separating into solids and liquid as it sits. A 200 g potato is enough for six bowls; more than that and the soup turns gluey.

Use less stock than you think. The instinct is to cover everything. Start with 900 ml, blend, and only then let the soup down to where you want it. You can always add liquid to a thick soup; you cannot take it out of a thin one without boiling away the flavour too.

Yogurt goes in off the heat. Thick 0 % Greek yogurt gives the tang and the pale swirl that cream gives, for no fat at all — but its proteins curdle above a simmer. Whisk a ladle of hot soup into the yogurt first to bring its temperature up gently, then stir that mixture back into the pan with the burner off. Done that way it stays smooth.

Spice is doing real work. Toasted coriander and a little smoked paprika read as depth on the tongue, which is exactly the gap fat leaves behind. A squeeze of lemon at the end lifts the whole thing; squash is sweet, and sweetness without acid tastes flat.

Ingredients

For roasting

• 1.2 kg peeled, deseeded pumpkin or butternut squash, in 4 cm chunks
• 1 large onion, cut into eight wedges
• 3 garlic cloves, left whole in their skins
• 1½ tbsp olive oil
• ½ tsp salt, black pepper

For the soup

• 1 floury potato (about 200 g), peeled and diced
• 900 ml–1.2 litres low-salt vegetable stock
• 1 tsp ground coriander
• ½ tsp smoked paprika
• ¼ tsp grated nutmeg
• 150 g 0 % Greek yogurt
• Juice of half a lemon

To finish

• A spoonful of the yogurt held back, chopped parsley or chives, a few toasted pumpkin seeds if you have them

Instructions

1. Heat the oven to 220°C fan. Toss the squash, onion wedges and unpeeled garlic with the oil, salt and pepper, and spread them in a single layer across two trays. Crowding one tray makes them steam, which is exactly the thing you are trying to avoid.
2. Roast for 25–30 minutes, turning once, until the edges are browned and a little blistered. This is where the flavour comes from — pale squash makes pale soup.
3. Meanwhile, simmer the diced potato in 900 ml of the stock in a large pan for about 15 minutes, until completely soft.
4. Squeeze the roasted garlic out of its skins and add it to the pan along with the squash and onion. Stir in the coriander, smoked paprika and nutmeg and let everything bubble together for 5 minutes so the spices lose their raw edge.
5. Blend until completely smooth — a stick blender needs a good two minutes, a jug blender about 45 seconds in batches. Keep going past the point where it looks done; the last bit of grain is what separates velvety from merely puréed.
6. Add more stock a little at a time until the soup is as loose as you like it. It should fall from the spoon in a ribbon rather than run off it.
7. Take the pan off the heat. Whisk a ladleful of the hot soup into the yogurt in a bowl, then pour that back into the pan and stir. Do not let it boil after this point.
8. Add the lemon juice, taste, and adjust the salt. Serve with a spoonful of yogurt swirled in, the herbs and a few toasted seeds.

Nutrition per serving

Calculated for six bowls, from raw ingredient weights.

• Total fat: 3 g
• Saturated fat: 0.5 g
• Calories: 170 kcal
• Protein: 6 g
• Fibre: 5 g
• Carbohydrate: 28 g

For comparison: the same soup started in 50 g of butter and finished with 200 ml of double cream comes out at roughly 25 g of fat a bowl. Nearly everything this version removes was added in the last two minutes of the usual recipe.

Variations

• Carrot and squash. Replace 400 g of the squash with carrots, roasted alongside. Sweeter, and it holds its colour better on reheating.
• Thai-leaning. Swap the coriander and paprika for 1 tbsp of red curry paste and finish with 100 ml of light coconut milk in place of the yogurt. Adds about 2 g of fat a serving.
• With red lentils. Add 100 g of rinsed red lentils with the potato and an extra 200 ml of stock. Takes the protein to around 11 g a bowl and makes it a meal rather than a starter.
• Roasted apple. One cooking apple, cored and quartered, roasted with the squash. Sharper and a little lighter.

Storing and reheating

The soup keeps for four days in the fridge and thickens noticeably as it sits — loosen it with a splash of stock or water when you warm it. Reheat gently and stop at a bare simmer, because the yogurt is already in it. If you plan to freeze it, freeze it before the yogurt goes in: leave that step until the day you serve it. Frozen that way it keeps for three months.

What to serve with it

It wants something with texture next to it rather than more softness. Good bread torn rather than sliced, or a slice of sourdough toasted dry under the grill, works better than anything buttered. For a fuller plate, a bowl of this alongside a leaf salad with chicory and apple makes a proper lunch for not much over 250 calories.

If this soup is opening a bigger meal, the side dish is where the fat usually creeps back in. Bread soaks up butter the way nothing else on the table does, so it is worth seeing how a low-fat stuffing holds together on 4 g of fat a serving before you plan the rest of the plate.

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Questions People Ask

Can I use tinned pumpkin purée instead?

You can, and it saves half an hour, but you lose the roasting step — which is where most of this recipe lives. If you do use it, take 800 g of purée, roast the onion and garlic anyway, and add a little extra smoked paprika to make up for the browning you did not get.

Why did my yogurt curdle?

It went in too hot or too fast. Yogurt proteins clump as they approach boiling, and dropping cold yogurt straight into a simmering pan does both at once. Take the pan off the heat, whisk a ladle of hot soup into the yogurt in a separate bowl first, then return the lot. If it has already split, a hard blend usually brings it back.

Is it still good without the potato?

It is thinner. The potato is there for starch rather than flavour, so if you would rather leave it out, replace it with 100 g of red lentils or simply use less stock and accept a lighter soup. White beans, blended in, do a similar job.

How do I get it properly smooth without a good blender?

Blend as well as you can, then push the soup through a fine sieve with the back of a ladle. It is a tedious two minutes and it works every time — this is how restaurant kitchens get that texture, not with more cream.