03About 25 minutes before the pork is done, whisk together the mustard and vinegar. Whisking constantly, add the olive oil in a slow, steady stream. Season with the salt and pepper. Place in a medium saucepan and set aside.04Place the potatoes in a saucepan, cover with water and simmer, covered, until tender but firm, about 6 minutes. Drain well, cover and keep warm. Place the dressing over low heat until hot, stirring constantly with a whisk. Place the potatoes in a bowl and gently mix in the hot dressing, the scallions and the bacon. Cover and keep warm.05Heat the bacon fat in the skillet over medium-high heat. Add the chicory in batches, tossing until wilted and bright green. Place in a mixing bowl as each batch is done. Toss with salt and pepper to taste.06Slice the pork into 1/4-inch slices and season lightly with salt. Mound the chicory in the center of 8 plates and drape 3 slices of pork over each mound. Surround with the potato salad and serve immediately.