| 1 |
In a 3-quart saucepan, melt 4 tablespoons of the butter; stir in the flour and cook until bubbly. Remove from heat and gradually add the milk; cook, stirring until thickened. Add the salt, thyme, pepper, mustard, and 2 cups of the cheese; stir until cheese is melted. Add the egg yolks and cook over low heat 3 minutes longer; set aside. |
| 2 |
Meanwhile, melt the remaining 3 tablespoons butter in a wide frying pan over medium heat; add the mushrooms and saute until lightly browned and the liquid is evaporated. Add mushrooms and butter to the cheese sauce. To the frying pan, add oysters and their liquid; simmer until the edges begin to curl. Drain off liquid and stir oysters into sauce, along with the crab meat, shrimp, and lemon juice. Turn mixture into a 2-quart casserole; sprinkle remaining cheese evenly over top. Cover and chill if made ahead. Before serving, bake, uncovered, in a 375 F oven until cheese is melted and mixture is heated through, 20 to 25 minutes (30 minutes if refrigerated). |