This is my own recipe for a delicious tart using agave nectar, key lime juice and a whole wheat butter crust. I was looking for a use for agave since I gave up white sugar as well as one using a whole wheat crust since I gave up white flour! Agave is low glycemic and metabolizes slower than sugar. The taste is indistinguishable from sugar (perhaps even better, in my opinion). I couldn't find whole wheat pastry flour in my area so I used Ultragrain White Whole Wheat flour by Eagle Mills. The crust was tender and flaky, not heavy at all. I make my crust in a food processor - or you can do it by hand. I use all organic ingredients when possible (butter, eggs, key lime juice, etc..) Also, if you're not a fan of key lime juice, lemon juice can be substituted, but also add some grated zest.