A QUICK OYSTER OPENER Place oysters on baking sheet into an oven which has been preheated to 375 F. Keep in oven for 3 to 4 minutes. Remove and plunge immediately into a metal bowl filled with water and ice. The oysters will open immediately. They should be plump, with a creamy, sandy color. Discard any oysters that are not alive, notably those that are dark or have a bluish or brownish color. SERVING: The oysters, chilled with the ice, will be ready for eating. Simply sprinkle with lemon juice and freshly-ground pepper and serve.