Preheat oven to 400 degrees F.
In a large bowl, mix egg, sugar, vanilla, orange zest, rhubarb, blueberries and 2 tablespoons flour. Pour mixture into a prepared, unbaked pie shell (8-inch).
In a small bowl, cut 3/4 cup flour, brown sugar, and butter together until pea-size clumps are formed. Sprinkle above mixture on top of pie filling.
Bake pie for 10 minutes. Lower heat to 350 degrees F and bake another 30-40 minutes until bubbly.
A viewer or guest of the show, who may not be a professional cook, provided this recipe. It has not been tested for home use.
Recipe courtesy Deb Perry 2002 for FoodNetwork.com's Perfect Pie Championship Cook-Off Competition