Summertime in Martha's Vineyard without delicious gluten-filled cookie crusted key lime pie has been a silent and sad loss. Until I realised I could probably make it myself with regular store bought gluten free cookie crust! And then realised just how insanely easy it is to make an impressive key lime pie. It's one of those recipes that looks hard until you realise there are about three ingredients in the filling. This pie is particularly good because the crust caramelises and becomes like a crispy toffee cookie cup filled with green citrus cream. Not exactly French... but let's call it an alteration on Tarte Citron... lemon tart. And every time I brought this pie to a party, it was destroyed in a particularly savage way. Always a good sign.