The fish case at Nelson's is one of the true marvels of the metro Phoenix food scene. Sometimes, the marine creatures inside are so rare and fresh they look lifted from science fiction. Big-lipped golden tilefish. Purple-veined Spanish mackerel roe. Chain-mailed sardines from Greece, dead eyes looking alive. Chris Nelson only flies in fish overnight. He has impeccable sources that hook him up with products that are mesmerizing. This is where to go when you want to cook seafood for someone you love, or to taste for yourself the glories of a scallop that was resting on a Massachusetts seabed yesterday.