Cook the potatoes for about 20 minutes longer, stirring them every 5 minutes. During the last 10 minutes, bring the heat up to medium and, if you wish, add more salt and pepper. The home fries are ready when the potato cubes are richly browned and clearly crisp with tender, melting centers.☞ TESTER TIP: Although you might be tempted to turn up the heat too early, that would be a mistake. The potatoes need adequate time to cook through before too much browning takes place.