The Giant King, signature dish at Eastside Fish, is immense. A pair of whiting fillets, each at least a half-pound, are dredged in seasoned cornmeal and crisp fried, then sandwiched between four slices of soft supermarket white bread. The fish is cream-moist and delicate, its brittle crust mottled with splotches of four-alarm Louisiana hot sauce and enveloped in a harmony of crunchy raw onion, dill pickle chips, and smooth yellow mustard.