Cheese Salad

Mash the yolk of 1 hard-boiled egg and rub smooth with
1 tablespoon of olive oil; add 1 teaspoonful of salt and
1/4 teaspoon of white pepper. Mix well. Add 1/4 lb. of grated cheese
and 1 tablespoonful of good vinegar. Mix smooth and serve in
shells or paper cases, with lettuce sandwiches.