Butterscotch Squares

1/2 Cup firmly packed brown sugar
1/2 Cup sugar
1/2 Cup water
1/4 Cup butter
2 tsp vinegar
1/2 capful vanilla extract

Combine all ingredients except the vanilla in a saucepan. Cook until mixture begins to boil.

Cover saucepan and boil without stirring until mixture reaches the soft cracked stage (275º to 280º).

Remove from heat and add vanilla. DON'T STIR. Pour quickly into a well-buttered pan. It should be in a thin sheet.