Parsnip and apple soup brings together the earthy sweetness of root vegetables and the gentle sharpness of fruit. The trick is to keep those flavours in balance: soften the onion patiently, choose an apple with some tartness and add the final squeeze of lemon only after blending. You get a smooth, savoury soup with a fresh finish. It is a straightforward lunch to make in one saucepan, with plenty of scope for a crunchy topping and a slice of bread alongside.
Getting the balance right
Parsnips become wonderfully creamy when cooked until tender and blended with stock. You do not need cream or a potato to give this soup body. A little milk at the end softens the flavour, but extra stock works just as well if you prefer a dairy-free version.
Choose firm parsnips without soft patches. Smaller ones are usually easier to prepare, although larger parsnips are perfectly useful too. If a large parsnip has a noticeably hard, woody centre, cut it lengthways into quarters and trim that part away. Weigh the vegetables after peeling and trimming so the amount of stock stays in proportion.
For the apple, look for a crisp eating variety with a tart edge. A very sweet, soft apple can make the finished soup taste sweeter than you want. Peeling the apple helps produce a particularly smooth texture, while removing the core keeps tough pieces out of the saucepan.
Ingredients
Serves four. Allow about 15 minutes for preparation and 35 minutes for cooking. You will need a large saucepan with a lid and a stick blender, or a jug blender suitable for soup.
- 1 tablespoon olive oil
- 1 large onion, finely chopped
- 2 garlic cloves, finely chopped
- 600g parsnips, peeled, trimmed and cut into roughly 2cm pieces
- 1 large tart eating apple, peeled, cored and chopped, about 180g prepared weight
- 1 teaspoon fresh thyme leaves, or half a teaspoon dried thyme
- 900ml vegetable stock, preferably a reduced-salt variety, plus extra if needed
- 100ml milk or unsweetened oat drink, or another 100ml vegetable stock
- 1-2 teaspoons lemon juice, to taste
- Freshly ground black pepper
- Salt, if needed after tasting
- 2 tablespoons pumpkin seeds, optional, to serve
- A little chopped parsley, optional, to serve
How to make parsnip and apple soup
- Soften the onion. Warm the olive oil in a large saucepan over a medium-low heat. Add the onion and cook for 8-10 minutes, stirring regularly, until soft and translucent. If it starts catching, lower the heat and add a small splash of water. Keep the onion pale for a gentle flavour.
- Add the aromatics. Stir in the garlic and thyme and cook for about a minute. Add the parsnips and apple, then stir for another 2 minutes so everything is coated with the onion mixture.
- Simmer until completely tender. Pour in the 900ml vegetable stock and bring to a gentle boil. Reduce the heat, put the lid partly on and simmer for 20-25 minutes, stirring occasionally. Test a few of the largest parsnip pieces with a knife: they should offer very little resistance. Allow a little longer if necessary.
- Blend carefully. Take the saucepan off the heat and let the soup stop bubbling. Blend with a stick blender, keeping the blade submerged to avoid splashes. For a jug blender, follow its instructions for hot liquids; blend in small batches and never seal hot soup into a blender designed only for cold ingredients.
- Adjust the consistency. Stir in the milk, oat drink or additional stock. Return to a low heat and warm gently, stirring. If the soup is still thicker than you like, add more stock a little at a time until it pours easily from a ladle.
- Taste and finish. Stir in 1 teaspoon lemon juice and some black pepper. Taste before adding the remaining lemon juice or any salt, as the stock may already provide enough seasoning. Divide between bowls and add the optional pumpkin seeds and parsley just before serving.
A smooth texture without losing the flavour
Thorough cooking makes more difference than lengthy blending. If your soup feels grainy, check that the parsnips were fully tender before reaching for extra liquid. You can return it to the saucepan, simmer gently for a few more minutes and blend again. Keep stirring if the mixture is thick, as it can catch on the bottom.
Hold back from thinning the soup too much at first. Apples vary in juiciness and parsnips vary in size and age, so the exact amount of liquid can change slightly. Add extra stock in small splashes after blending. The finished texture should feel velvety and spoonable, with enough substance to hold a scattering of seeds on top.
What to serve alongside
A chunk of wholemeal bread or a slice of toast is a simple partner. For a more substantial lunch, serve the soup with cheese on toast, a boiled egg or a small bean salad. Choose the accompaniment according to your appetite and what is already in the kitchen.
Keep toppings small so they complement the apple and parsnip. Pumpkin seeds give crunch, parsley adds freshness, and a spoonful of plain yoghurt introduces a tangy contrast. Add yoghurt to individual bowls rather than stirring it into the whole saucepan, especially if you plan to store some soup.
Simple variations
- Gently spiced: add half a teaspoon ground cumin and half a teaspoon ground coriander with the garlic. Stir briefly before adding the vegetables, taking care that the spices do not scorch.
- With fresh ginger: add 1 teaspoon finely grated ginger with the garlic. This gives a warm, bright note without overwhelming the apple.
- With a leek: replace the onion with one large leek, using the white and pale green parts. Slice and wash it thoroughly, then soften it in the oil before continuing.
- Dairy-free: use the extra stock or unsweetened oat drink and leave off any yoghurt topping. Check the stock ingredients if you need the whole meal to be vegan.
Storing and reheating
Divide leftover soup into smaller containers so it cools promptly, then cover and refrigerate within two hours. Use within two days, or freeze individual portions once cooled. Leave a little space at the top of each freezer container for expansion and label it so you can identify it easily.
Defrost frozen portions in the fridge before reheating. Warm in a saucepan, stirring regularly, until steaming hot throughout. Parsnip soup often thickens as it stands, so add a splash of water or stock to loosen it. Reheat only the portion you need, and add fresh toppings once it is in the bowl.
