Preheat oven to 350 degrees.
In a bowl, combine the flour and sugar; cut in butter until crumbly. Press into a greased 9 x 13 baking dish.
Bake for 20 minutes; cool while preparing filling.
For the filling, combine sugar, flour and salt in a mixing bowl. Stir in egg yolks and cream; add rhubarb.. Pour over crust.
Bake at 350 degrees for approximately 50-60 minutes or until set.
For the meringue topping, beat egg whites and cream of tartar on medium speed until soft peaks form.
Gradually beat in sugar, a tablespoon at a time, until stiff peaks form. Beat in vanilla.
Spread over hot filling and bake for 12-15 minutes until golden brown.
Cool on a wire rack; refrigerate for 1-2 hours before serving. Yields 12-15 servings.
