I have been keeping cool lately by following along here. Ambitious home cook that I am (and totally in denial of the hot weather), I figured while I was hanging out there on the Queen Mary 2, I would make David’s lime meringue tart. After all, unlike Paris, down here we have an almost unlimited supply of key limes, so we should be making such delicacies more often. I knew mine would come out more rustic than the pastry chef’s (also, I don’t have a quaint Moroccan basket to bring it to my Parisian potluck picnic– sigh). But hey, I would like to see his piping technique with nothing but a snipped off corner of a sandwich bag filled with meringue. My key lime…