1. Boil potatoes until they are fork tender. Drain the potatoes and set aside. 2. Meanwhile, cook the bacon in a skillet over medium-low heat until crisp. Remove bacon with a slotted spoon and place on a paper towel-lined plate to drain. Pour off all but 2 tablespoons of the bacon drippings from the skillet and remove the pan from heat. 3. Add the mayonnaise, mustard, sugar and salt to the reserved bacon drippings in the skillet and whisk to combine. 4. In a large bowl, combine the potatoes, eggs, celery, onion and green pepper. Pour the dressing over the ingredients and gently stir before serving. Leftovers can be stored, in the refrigerator for up to 4 days.