Celery-Apple Salad with Currants and Walnuts

This is a sophisticated cousin to the familiar Waldorf salad, but the creamy dressing is replaced with a walnut oil vinaigrette. Crisp and refreshing in taste and appearance, celery salad travels well and is put together easily. The pale green celery and golden apples are very pretty dotted with currants, and the salad contains nothing you can’t buy in a supermarket. However, if you have garden thinnings of rocket (arugula), mustard greens, cress, or nasturtium leaves, you can strew them ov