Why should the potatoes be dressed while warm?

When potatoes are warm, their starch structures are open and absorb the oil and vinegar into the flesh. Dressing cold potatoes only coats the exterior, yielding a noticeably less flavourful salad.

Does this potato salad contain allergens?

Yes, mustard is one of the 14 UK Food Information Regulations regulated allergens. Both Dijon mustard and wholegrain mustard contain mustard. The recipe is gluten-free and dairy-free.

How long can this salad sit out at a summer picnic?

Even without mayonnaise, cooked potatoes and fresh herbs should not remain at ambient summer temperatures (above 17°C) for longer than 2 hours. Keep the salad in an insulated cool bag with an ice pack until ready to eat.

Which potato varieties work best?

Waxy, firm-fleshed varieties are essential so pieces hold together cleanly when tossed. British Jersey Royals are the premier seasonal choice from late spring, while Charlotte and Anya are reliable year-round varieties.

New Potato Salad Recipe with Herbs and Mustard

Fresh herby new potato salad in a white bowl with tender boiled new potatoes tossed in wholegrain mustard dressing, parsley and chives

Why This Recipe Works

Dressing the potatoes while they are warm allows the tangy mustard vinaigrette to absorb deep into the flesh.
A lighter, fresher vinaigrette alternative to heavy mayonnaise-based potato salads.
Brimming with fresh British herbs: flat-leaf parsley, snipped chives and a hint of garden mint.
Holds up beautifully at outdoor picnics and barbecues without spoiling as quickly as egg or dairy dressings.

What You Need

New potatoes, extra virgin olive oil, white wine vinegar, wholegrain and Dijon mustards, a touch of honey, flat-leaf parsley, chives and fresh mint for a vibrant summer salad.

Fresh British Jersey Royal new potatoes in a ceramic bowl on a wooden picnic table ready for making potato salad

New potatoes, scrubbed and larger ones halved – Jersey Royals, Charlotte or Anya waxy varieties hold their shape and texture perfectly.
Generous pinch of fine sea salt (for cooking water) – Essential to season the potato flesh thoroughly from the inside out.
Extra virgin olive oil – Forms the fruity, unctuous foundation of the vinaigrette dressing.
White wine vinegar – Provides crisp acidity to balance the earthy potatoes; cider vinegar is an excellent alternative.
Wholegrain mustard – Adds pleasant texture, mild acidity and visible rustic mustard seeds. (Contains mustard allergen).
Dijon mustard – Creates a smooth emulsion and adds a sharper pungent kick. (Contains mustard allergen).
Caster sugar or honey – Softens the sharp vinegar edge and balances the mustard tang.
Fine sea salt and freshly ground black pepper – Season dressing to taste before tossing with warm potatoes.
Fresh flat-leaf parsley, finely chopped – Provides clean, grassy flavour and vibrant green flecks.
Fresh chives, finely snipped – Adds a delicate mild onion note; snip with scissors to prevent bruising.
Fresh garden mint leaves, finely chopped (optional) – Traditional British pairing that adds exceptional summery freshness alongside grilled fish.

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How to Make Herby New Potato Salad with Mustard Dressing

Step 1: Cook the potatoes

Scrub the new potatoes clean and halve any larger ones so all pieces are roughly 3–4cm in size. Place them in a large saucepan, cover generously with cold water, and add a generous pinch of salt. Bring to a boil over high heat, then reduce to a steady simmer for 15–18 minutes until tender when pierced with the tip of a sharp knife. They should yield easily without crumbling apart.

Step 2: Whisk the mustard dressing

While the potatoes simmer, prepare the dressing. In a small bowl or clean screw-top jar, combine the extra virgin olive oil, white wine vinegar, wholegrain mustard, Dijon mustard, sugar or honey, fine salt and freshly ground black pepper. Whisk vigorously or shake the sealed jar until completely emulsified into a cohesive, golden dressing.

Step 3: Dress the potatoes while warm

Drain the potatoes thoroughly in a colander and leave for 1 minute to allow surface steam to escape. While still warm to the touch, transfer the potatoes to a large mixing bowl and pour two-thirds of the dressing over them. Toss gently with a large spoon. Dressing warm potatoes is crucial: the heat relaxes the potato starches, pulling the tangy dressing deep into the flesh.

Step 4: Cool and add fresh herbs

Allow the dressed potatoes to cool at room temperature for 15–20 minutes. Once cooled to lukewarm or ambient temperature, add the finely chopped flat-leaf parsley, snipped chives, and chopped mint if using. Fold gently with a large spoon so the tender potato pieces remain intact and the fresh herbs distribute evenly.

Step 5: Add remaining dressing and serve

Drizzle the reserved remaining dressing over the salad and toss once more for a glossy, vibrant finish. Taste and adjust seasoning with an extra pinch of sea salt or black pepper if needed. Serve at room temperature alongside grilled fish or barbecue meats. Do not serve fridge-cold, as cold solidifies the olive oil and mutes herb flavours.

Serving Suggestions & Plating

Serve at room temperature—not straight from the fridge—as a generous side dish. The salad pairs naturally alongside grilled fish or sliced roast chicken, or as part of a British summer picnic spread.

Herby mustard dressed new potato salad served alongside pan-seared fish on a summer British dining table

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