Preheat oven to 350*
Grease with Pam or lightly butter, your pie plate, set aside
Wash, dry rhubarb stalks, remove ends and dice 4 C. rhubarb into 1/2" pieces
Add diced rhubarb and raspberries into mixing bowl
Add dry ingredients into bowl, stirring each time to mix, then add Grand Marnier, stir to mix
Roll out 1 pie dough pastry, add to greased pie plate
Fill pie dough with ingredients from the bowl
Cover with top pastry, rolled out, trim edges and pinch, Put small slits into top crust to vent steam.
Use a pastry brush to brush on Half and Half or milk, then sprinkle on the Cane Sugar
Cover pie rim with tin foil or a pie shield for the first 35 minutes
Remove pie shield or foil, continue baking for another 30 minutes or until bubbles come through the pie slits
Remove, and cool on rack till cool to the touch, then I put the pie in the refrigerator for 2 hours before serving, to let all of the juices meld together...easier to cut and serve.
Enjoy!