Potato Salad

Put the potatoes and eggs into a big saucepan of cold salted water. Bring to a simmer. After 12 minutes remove the eggs with a slotted spoon and let cool. Continue cooking the potatoes until a paring knife poked into them goes in without resistance, about 3 minutes longer. Drain the potatoes in a colander and let them cool. Reserve some scallion greens and capers for garnish . Meanwhile, stir together the mayonnaise, mustard, pickles and their juice, onion, remaining scallions and capers, parsley, and lemon juice in a bowl large enough to hold the potatoes. Peel the cool eggs and grate them into the bowl. Stick a fork into the potatoes and lift them 1 at a time out of the colander . Break up the potatoes by hand into rough chunks, add them to the bowl and toss to coat with the dressing . Season, to taste, with salt and pepper. Drizzle with a little olive oil before serving.