ABOUT THIS RECIPEThe Dressing That Soaks Into Warm Potatoes
This warm salad is all about the moment when the potatoes are still warm and the dressing clings to them. Waxy potatoes stay firm enough to slice, but still pick up some dressing on the outside. Mustard emulsifies the olive oil and lemon juice; capers add little salty, tangy accents. Taste the dressing before adding it to the potatoes: capers vary in saltiness, so you may not need any extra salt.
New potatoes are a lovely choice, especially in late spring and summer, but waxy potatoes are available all year round. Choose potatoes that are roughly the same size so they cook at the same time. You can leave the skins on if they’re thin and clean; for potatoes with thicker skins, peeling is more pleasant. Don’t slice the cooked potatoes too thinly: thicker slices are easier to toss without falling apart.
The eggs provide a creamy, rich contrast to the fresh watercress and lemon. Seven minutes of cooking will generally give you a soft centre, but treat the cooking time as a guide: large, cold eggs may need a little longer. Prefer a fully set yolk? Cook them for about nine minutes instead. Rinse the eggs under cold water after cooking so they’re easier to peel and don’t continue cooking.
Watercress has a mild pepperiness that goes well with the mustard and capers. Toss the leaves into the salad at the very end, or they’ll quickly lose their fresh texture. Flat-leaf parsley and chives add herbal, green notes without overpowering the other flavours. No watercress on hand? Use rocket for a similar peppery bite, or baby spinach for a milder salad.
Sunflower seeds aren’t just a garnish here: a quick toast makes them nutty and adds a crunchy element to every bite. Pumpkin seeds can be used in the same way. Serve the salad as soon as the potatoes have absorbed the dressing, as a light lunch or dinner. Cover and refrigerate leftovers, and eat them within two days; if making the salad ahead, keep the watercress and seeds separate if possible so the leaves stay fresh and the seeds remain crunchy.