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1
Bring clam juice and wine to simmer in heavy large pot.
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2
Add clams, then mussels to pot.
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3
Cover; cook until shellfish begin to open, about 2 minutes for mussels and about 8 minutes for clams.
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4
Using slotted spoon, transfer shellfish to large bowl as they open.
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5
Discard any that do not open after 12 minutes.
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6
Reserve liquid in pot.
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7
Add shrimp shells to cooking liquid.
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8
Cover and simmer over low heat 10 minutes, stirring occasionally.
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9
Strain liquid into 4-cup glass measuring cup.
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10
Discard solids.
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11
Melt butter in clean large pot over low heat.
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12
Add leek.
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13
Cover; cook until leek is tender, stirring occasionally, about 10 minutes.
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14
Add potato and celery root.
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15
Pour in reserved cooking liquid, leaving any sediment in measuring cup.
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16
Add Calvados.
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17
Bring to simmer.
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18
Cover and simmer until potato is almost tender, stirring occasionally, about 5 minutes.
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19
Stir in shrimp and scallops.
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20
Cover; simmer 2 minutes.
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21
Whisk creme fraiche, egg yolks and lemon juice in small bowl to blend.
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22
Stir into stew.
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23
Return clams and mussels to pot.
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24
Cover and cook without boiling until shrimp and scallops are just cooked through, stirring occasionally, about 5 minutes.
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25
Season with salt and pepper.
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26
Divide among bowls.
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27
Sprinkle parsley over.