Quite often when buying food, I have an idea of a dish to make. Recently, on one of the last hot muggy days of summer, I found myself shopping with only flavors in mind.  Lobster, cashews, ginger, and shallots. It was as if I were in a dream – or a Graham Greene novel! Soon at home, amid the smells of frying shallots, green chili paste, and cilantro wafting through my kitchen, voila, a plate appeared before me with this exquisite lobster salad.