Got this from the Andrew Weil website, and I havent tried it yet but it looks both simple and tasty, so I'm hoping to give it a try. Time estimates do not include time for crust preparation, nor cooling time.
Heat the blueberries in a saucepan over medium heat until they begin to boil. Simmer gently for 10 minutes.
Add the sugar, lemon juice, and cinnamon, and cook for another 2 minutes.
Mix the cornstarch or arrowroot well with the water, and pour mixture into the simmering blueberries while stirring. Cook, stirring, until mixture becomes clear and thick. Continue to cook for 1 minute. Remove from heat and cool.
Spoon mixture into the pie crust and refrigerate for at least 2 hours before serving.