Jersey Royal Potato Salad with Mustard Dressing makes a simple seasonal side dish with tender potatoes, fresh herbs and a glossy vinaigrette. The dressing combines smooth Dijon and wholegrain mustard, giving you both a lively flavour and a little texture. There is no need for a heavy coating: the potatoes should still be the main attraction. Serve the salad warm alongside chicken or fish, or let it cool while you prepare the rest of dinner. A gentle simmer and a few minutes of resting time make all the difference to the finished bowl.
Choose and prepare your potatoes
Choose firm Jersey Royals with intact skins, avoiding potatoes with green patches or soft spots. Their thin skins need a gentle wash rather than peeling. Rub away soil under cool running water, using your fingers or a soft vegetable brush. Scrubbing too hard can remove the delicate skin.
Keep small potatoes whole and halve any larger ones so the pieces are reasonably similar in size. This helps them finish cooking together. The recipe makes four side portions and takes approximately 35 minutes, depending on the size of the potatoes. You will need a saucepan, a colander and a mixing bowl large enough to fold everything together comfortably.
Ingredients for the salad and dressing
For the potatoes
- 750 g Jersey Royal potatoes
- 1 teaspoon fine salt for the cooking water
- 1 small shallot, very finely chopped
- 2 tablespoons chopped flat-leaf parsley
- 1 tablespoon finely snipped chives
- Freshly ground black pepper, to taste
For the mustard dressing
- 3 tablespoons extra virgin olive oil
- 1 tablespoon white wine vinegar
- 2 teaspoons wholegrain mustard
- 1 teaspoon Dijon mustard
- 1 teaspoon runny honey, optional
- 1 tablespoon warm potato cooking water, plus more if needed
- A small pinch of salt, to taste
The honey rounds off the sharper edges of the vinegar and mustard. Leave it out for a more assertive dressing, or use a little maple syrup for a vegan version. Use an olive oil whose flavour you enjoy, since it will be noticeable in this uncooked dressing.
Make the potato salad
- Start the potatoes in cold water. Put the washed potatoes in a saucepan and cover with cold water by about 2 cm. Add the teaspoon of salt. Bring to the boil, then reduce the heat to a gentle simmer.
- Cook until just tender. Simmer for approximately 12-18 minutes, checking earlier for particularly small potatoes. A thin knife should slide into the centre with little resistance. Remove smaller potatoes as they become ready if the larger pieces need more time.
- Soften the shallot. While the potatoes cook, combine the chopped shallot and vinegar in your mixing bowl. Leave for about 10 minutes. This takes some of the edge off the raw onion flavour.
- Whisk the dressing. Stir the wholegrain mustard, Dijon and optional honey into the shallot mixture. Whisk in the olive oil gradually. Before draining the potatoes, reserve a little cooking water and whisk 1 tablespoon into the dressing.
- Drain and briefly dry. Drain the potatoes thoroughly in a colander. Leave for 2-3 minutes so excess moisture can evaporate. They should be warm when they meet the dressing, with surfaces that look dry rather than wet.
- Fold together. Add the warm potatoes to the bowl and gently turn them through the dressing with a broad spoon. Work from underneath to avoid breaking them. Rest for 5 minutes, then fold once more to redistribute the dressing.
- Finish with herbs. Once the potatoes are warm rather than steaming hot, add the parsley and chives. Taste a dressed potato and season with pepper and a little extra salt if needed. Spoon into a serving dish, including any dressing left in the bowl.
For smaller bites, slice the cooked potatoes after draining and briefly drying them. Use a sharp knife and keep the slices fairly thick. Thin slices can crumble as you turn them through the dressing, particularly if the potatoes are very tender.
Keep the texture light and the flavour balanced
Watch the simmer
A rolling boil knocks potatoes against each other and encourages split skins and ragged edges. Lower the heat as soon as the water boils. Check tenderness by lifting out a potato and piercing it, rather than repeatedly stabbing several pieces in the pan.
Taste after the short rest
Give the potatoes a few minutes in the dressing before adjusting the seasoning. Taste a piece with some shallot and herbs, rather than tasting only the liquid at the bottom of the bowl. The balance should be savoury and gently sharp, with enough mustard to notice without overwhelming the potatoes.
If the dressing tastes too sharp, add another teaspoon of olive oil or a small drizzle of honey. If it feels heavy, add a few drops of vinegar. If the salad looks dry, try a teaspoon of warm water before adding more oil. Fold gently after each adjustment and taste again.
Simple variations and serving ideas
Keep additions modest so the Jersey Royals remain central. A tablespoon of drained, chopped capers gives the dressing a briny edge; taste before adding further salt. For a different herb combination, replace half the parsley with dill. A little chopped tarragon also works, but use it sparingly because its flavour is stronger.
You can replace the shallot with two finely sliced spring onions. Put the white parts into the vinegar and add the green parts with the herbs. This gives a softer onion flavour while keeping the same straightforward method.
Serve the salad with baked fish, roast chicken or a simple omelette. Crisp leaves on the side give the meal a fresh contrast. Before serving, gently turn the potatoes once more to pick up any dressing that has settled underneath.
Preparing ahead
If you are making the salad ahead, cook and dress the potatoes, then cool and refrigerate promptly in a covered container. Reserve the herbs and fold them through shortly before serving so they stay fresh. After chilling, stir carefully and check the seasoning again. A teaspoon of water can loosen dressing that has thickened. Finish with chives and black pepper, and spoon any remaining mustard dressing over the potatoes as you serve.
