Where did the idea of using alcohol in pie crust come from?
In November 2007 a recipe was published in Cooks Illustrated for a Foolproof Pie dough with vodka. That recipe was created by J. Kenji Lopez-Alt who was one of the chefs on America's Test Kitchen and writer for Cooks Illustrated. He has an article about the recipe here http://sweets.seriouseats.com/2011/07/the-food-lab-the-science-of-pie-how-to-make-pie-crust-easy-recipe.html?ref=sweets-sb3. As far as I know this was not a well-known trick and Lopez-Alt came up with it originally.