Planning for spring: blackberry pie

I have five extra minutes and a blue post-it in my hand. Fellow aikidoist Erin brought an extraordinary blackberry pie to to a semi-recent potluck. (She's now hiking with her husband to the Aleutians Islands. They started in Seattle. Ambition has a new name.) She gave me the recipe. It's not a traditional pie. It's more like a pie crust filled with a blackberry mousse. Check it:

- One pie crust; bake ahead of time; you're on your own on pie crust; choose your own adventure
- One large yogurt container full of fresh blackberries; de-seed in a food mill
- Sugar to taste (between .5 and 1 cup)
- 2 Tbsp butter; melted
- 1/3 cup corn starch; dissolved in water

Cook on medium, stirring constantly, until thickened. Pour into pie crust. Set in fridge.