The reason that the temperature matters for potato salad ... vinegar and Dijon mustard ramp up the sweet-sharp notes. A top tip to keep the potatoes warm while you finish the dressing is to ...

It's creamy and tangy, with a decadent mayonnaise dressing ... packed German potato salad to sweet and tart French potato salad (beloved for its use of shallots and Dijon mustard), there are ...