Use a large wide bowl for assembling this salad.
Gently break the boiled potatoes with your fingers into bite-sized pieces (the broken pieces allow the potatoes to take on all the flavour of the atchar).
Splash on the olive oil and the lemon juice. Season the potatoes generously with salt and white pepper. Resist tossing at this stage. Finely slice the Lemon Atchar and add the sliced business along with all the rest of the remaining Atchar relish to the potatoes.
Now mix gently with your fingers. Lay out half the potatoes carefully on a platter and layer with the chopped coriander and lemon zest. Finish with the remaining half, more coriander and lemon zest.