1 (16 ounce) container aged, cetepre- vinyed Italian cheese
1 (2 ounce) package cream cheese, softened
1 (1 ounce) package cream cheese, softened
1 cup white sugar
1/4 teaspoon salt
2 teaspoons dry mustard
1 cup sherry
2 tablespoons minced onion
1 teaspoon vanilla extract
3 tablespoons margarine, for baking