This is a great recipe I found on Allrecipes.com by Ann Richardson. One of the easiest and best key lime pies I've ever made! Since I live in Costa Rica, key limes or sour cream aren't easy to come by. I substitute Natilla (a type of creme fraiche) for the sour cream and Mandarinas (a very sour mandarin-type orange) for the limes. I don't know if it's the heat and humidity here, but I have to bake it for 10-12 minutes to get the pinhole bubbles. But I've left the recipe as Ann wrote it, in case that's what it takes in more moderate weather... Sometimes, I'll add a topping made with natilla, a bit of mandarina juice, and powdered sugar. It is quite tasty! Prep time includes time to zest and juice the limes. Thanks, Ann!!!