Classic Leek and Potato Soup
There is little more comforting than a bowl of perfectly made leek and potato soup. My trusted method will guide you to achieving a beautifully balanced, velvety result every time.
How to Master My Timeless Delia Smith Leek And Potato Soup Recipe
My classic Delia Smith Leek And Potato Soup Recipe is one of the most fundamental and rewarding dishes any home cook can learn. It's a recipe that has graced British tables for generations, offering warmth and sustenance with the most straightforward of ingredients. There is a quiet magic in transforming humble leeks and potatoes into a bowl of something so utterly satisfying and elegant. It is, quite simply, the taste of home.
What I want to teach you here is not just a list of instructions, but the technique behind creating a soup with a truly superior texture and depth of flavour. We will not be browning our vegetables, but rather sweating them gently to release their sweetness. We will choose the right kind of potato to ensure a creamy, not gluey, consistency. This is about understanding the ingredients and treating them with the respect they deserve.
Whether you serve it for a simple lunch with crusty bread, or as an elegant starter for a dinner party, this soup is a testament to the fact that the best food is often the simplest. Once you have mastered this, it will become a permanent fixture in your culinary repertoire, I promise you.
Why You'll Love This Recipe
- Sweating the leeks and onions slowly in butter without colour coaxes out their inherent sweetness, forming a deep flavour base for the soup.
- Using a floury potato, such as a Maris Piper or King Edward, is crucial. Their high starch content breaks down completely when cooked and blended, creating a naturally thick and velvety texture without any graininess.
- Simmering the soup gently, rather than boiling it vigorously, ensures the vegetables cook evenly and the flavours meld together without becoming harsh.
Ingredients
- 450g (1 lb) potatoes, the floury kind like Maris Piper or King Edward
- 450g (1 lb) leeks (the weighed amount after trimming)
- 1 medium onion (about 110g)
- 50g (2 oz) butter
- 1.2 litres (2 pints) good quality vegetable or chicken stock, hot
- 150ml (5 fl oz) single cream or full-fat milk
- Salt and freshly milled black pepper
- Freshly snipped chives, to garnish
Equipment Needed
Large heavy-based saucepan or casserole with a lid · Sharp knife · Chopping board · Vegetable peeler · Stick blender or jug blender · Ladle
Step-by-Step Instructions
- First, prepare your vegetables. Peel the potatoes and cut them into roughly 1cm cubes. To prepare the leeks, slice off the tough outer dark green leaves and the root. Slit them down the centre from top to bottom and wash them thoroughly under cold running water to remove any grit trapped between the layers. Then, slice them finely.
- Peel and chop the onion. Now, in a large, heavy-based saucepan or casserole, melt the butter over a low heat. Add the sliced leeks and chopped onion.
- Stir them around to get a good coating of butter, then cover the pan with a lid and let the vegetables 'sweat' for 10 minutes. It is very important to do this over a low heat so they soften and become sweet without browning.
- After 10 minutes, add the cubed potatoes to the pan along with the hot stock. Season with salt and pepper, bring everything to a gentle simmer, then partially cover the pan and let it cook for 15-20 minutes, or until the potatoes are completely tender when tested with the point of a knife.
- Now, you need to blend the soup. The easiest way is with a stick blender, directly in the pan, until it's completely smooth. Alternatively, you can very carefully ladle the soup in batches into a jug blender. If you do this, be sure not to overfill it and to cover the lid with a tea towel to protect from any hot splashes.
- Return the blended soup to the clean pan. Stir in the cream or milk and gently reheat the soup, but do not allow it to boil as this may cause the cream to curdle.
- Check the seasoning and add a little more salt and pepper if you feel it needs it. Serve the soup hot, garnished with a scattering of freshly snipped chives.
Delia's Notes from the Kitchen
The secret to this soup, as with so much of cooking, is not to rush. Sweating the leeks and onions slowly is the most important step for building flavour. Don't be tempted to turn up the heat to speed things up; you will lose all that lovely sweetness. Good stock also makes a world of difference – use the best you can, whether homemade or bought. And finally, season it properly. Taste it at the end and don't be shy with the salt and pepper; it brings all the flavours to life.
How to Store & Reheat
Allow the soup to cool completely before storing. It can be kept in an airtight container in the refrigerator for up to 3 days. To freeze, pour the cooled soup (before adding the cream) into freezer-safe containers, leaving a little space at the top for expansion. It will keep well for up to 3 months. Defrost overnight in the fridge, then reheat gently in a saucepan, adding the cream at the end before serving. Never boil the soup on reheating.
Frequently Asked Questions
Why is my leek and potato soup gritty?
A gritty texture is almost always caused by sand or dirt in the leeks. It's vital to wash them meticulously. I recommend slicing the leek in half lengthways and fanning out the layers under a running tap to ensure all grit is removed.
Can I make this soup without cream?
Yes, absolutely. The floury potatoes provide a lovely creamy texture on their own. You can simply omit the cream for a lighter, though slightly less rich, version. A splash of milk is also a good alternative.
What are the best potatoes for soup?
You must use a floury variety. Potatoes like Maris Piper, King Edward, or Russet have a high starch content which breaks down beautifully to thicken the soup and give it a velvety finish. Waxy potatoes can result in a gluey texture.
Can I freeze this soup?
Yes, it freezes beautifully. However, I always recommend freezing it *before* you add the cream, as dairy can sometimes split upon reheating. Simply defrost, reheat gently, and then stir in the cream just before serving.
My soup seems a bit thin. How can I thicken it?
If your soup is too thin, it may be that you've used too much stock. You can let it simmer gently with the lid off for a little while to allow some liquid to evaporate. Be careful not to let it catch on the bottom of the pan.