Clean and chop the strawberries and rhubarb, and set aside. I cut the strawberries into fourths, and did about 1/4" - 1/2" piece for the rhubarb.
If you are making your own crust it will need to sit in the refrigerator for about an hour so make sure to prepare it first.
In a large mixing bowl combine the sugar and flour. Add the chopped strawberries and rhubarb and combine well. Let this sit for at least 30 minutes.
When you are ready preheat your oven to 400 degrees. Divide your crust in two and roll out the first portion. Line a pie plate with the crust. Spoon in the strawberry mixture.
Roll out the second portion and top the pie. Cut the excess crust from the edges with a knife. Crimp the top and bottom together with a little water on your fingers.
Beat the egg with about 2 tbsp of water and brush the top of the pie. Sprinkle a little sugar on top as well if you choose. Make a slit in the center so the steam can escape.
Bake at 400 degrees for 35-40 minutes or until the pie has started to brown and the juices are bubbling.
