Preheat oven to 400F. In a large bowl, combine the first seven ingredients. Let stand for 15 minutes to soften tapioca. Place bottom pastry in a deep dish 9 inch pie plate. Add filling: top with a lattice crust. Bake at 400F for 20 minutes. Reduce heat to 375F. Bake 30 minutes more or until filling, is bubbly and rhubarb is tender.
Cajun Country -- New Iberia, Louisiana