Shred the cabbage fine and then chop the green pepper. Place in water to crisp.
Make a mayonnaise dressing by placing egg yolk, mustard, paprika, sugar, and vinegar on a plate. Work to a smooth paste and then add the oil slowly at first and then faster until all the oil is thoroughly incorporated, beating it quite hard. Add the salt to taste. Now add the vinegar to reduce to desired consistency.
Drain the cabbage, turn on a cloth and let dry before pouring over the dressing.