Step 1: Beating

Preheat oven
to 200F. Line cookie sheet with brown paper bag or parchment. In a medium sized bowl at high speed, beat egg whites, cream of tartar and salt till fluffy. Gradually beat in sugar. Add vanilla.

Step 2: Baking

Place in
pastry bag fitted with a medium plain piping tip. Pipe 3" bone shapes onto parchment or brown paper bag. Bake 1 hour until set. Turn off oven, dry in oven 1 hour.