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1
Place fish bones and heads in a 2 1/2-quart souffle dish with a tight-fitting lid and pour beer over top.
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2
Cover with lid and cook in a 650- to 700-watt oven at 100 percent power for 15 minutes.
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3
Remove lid and cook for 5 minutes longer.
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4
Remove from oven and uncover.
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5
Strain broth through a fine sieve.
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6
Discard solids and reserve broth, there should be about 1 3/4 cups; add water if needed to make 1 3/4 cups.
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7
In same souffle dish, place 1 tablespoon butter and cook, uncovered, at 100 percent power for 1 minute.
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8
Remove from oven and stir in mushrooms, shallots, celery, and parsley.
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9
Cover with lid and cook at 100 percent power for 3 minutes.
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10
Remove from oven and uncover.
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11
Stir in fish and add reserved broth.
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12
Cover with lid and cook at 100 percent power for 5 minutes.
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13
Remove from oven and uncover.
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14
With a slotted spoon remove all solids to a bowl and reserve the cooking liquid in the dish.
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15
In a medium-size bowl whisk together cream and egg yolks.
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16
Gradually whisk in about 1 cup of cooking liquid.
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17
Whisk mixture back into souffle dish.
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18
Cover with lid and cook at 100 percent power for 5 minutes, stirring once during cooking.
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19
Remove from oven and uncover.
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20
Whisk in remaining butter until melted and season with salt and pepper.
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21
Return fish and vegetables to souffle dish and serve.