shortening or margarine
Beat the egg, pour it and the vanilla over the rhubarb, and mix them together.
Pour all the sugar at once onto the mixture and combine until the sugar is taken up and the rhubarb is covered.
Sprinkle salt and flour on the mixture and mix again.
Dump the whole mixture into the pie shell and spread it flat.
Drop small pats of margarine onto the surface of the fruit mixture.
Bake in a 350-degree F oven for between 30 and 45 minutes, until filling firms up.