2 lb. firm fleshed fish steaks or fillets, such as   monkfish, halibut or cod, cut into 1, 1/2 inch   chunks
2 lb. tender fleshed whole fish, such as   red snapper, ocean perch or rockfish, cleaned   and left whole if small or cut into 1 1/2 inch   chunks or filleted if large
2 leeks, white portion only, chopped and rinsed   well
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