Cream Salad Dressing

Yolks of 4 eggs
6 teaspoonfuls sugar
1 teaspoonful salt
1 teaspoonful dry mustard
2 teaspoonfuls corn starch
1 cup milk or cream
Piece butter size of walnut
1 cup vinegar

Mix dry ingredients; then add egg and milk, last vinegar. Drop butter in vinegar, then pour in the other. Cook in double boiler till thick.