One of my most favorite sammies in the world is a flaky yet succulent grouper sandwich, preferably served with fries, cole slaw, pickle spear, and cold beer. To get such a treat you should go to southwestern Florida, where you might be temped by other similar delights...a soft-shelled crab sandwich, say, or even an oyster po'boy. But the crab sandwich can be readily procured in a Maryland clam