Massage the cabbage lightly with salt and set aside for a few minutes. Squeeze and drain excess water out of the salted cabbage. Combine with the rest of the ingredients for the cole slaw. Add in potato chips and mix to combine.
Top the bread slices with shredded cheese and place under broiler until melted.
Place lettuce leaf, tomato slices, roast beef, boiled egg and cole slaw on top of the bread. Place second slice of bread on top.