1) Mix together salt, sugar, paprika for the french dressing.
2) Stir in vinegar and salad oil, shaking well.
3) Keep the mixture in refrigerator to allow chilling.
4) In a salad bowl, break up lettuce.
5) Mix in onions and green peppers.
6) Toss this mixture with french dressing.
7) Serve at once with Parmesan cheese.