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1
For the Mousseline: Grind the scallops and the shrimp (separately) in a meat grinder or food processor, then cool both in the refrigerator for 1/2 hour.
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2
Place the scallops in a bowl with 1 egg, 1 egg white (reserve the yolk for the salmon), salt, pepper, and nutmeg.
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3
Put the scallop mixture in a food processor and run for 1 minute.
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4
Slowly add cream until blended (about 3 seconds).
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5
Do not overblend or mixture will be buttery.
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6
Add truffles to scallop mixture and set aside.
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7
Place the salmon in a processor bowl with the other egg, the reserved egg yolk, salt and pepper.
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8
Process for 1 minute.
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9
Butter the ramekins or molds, then spoon the scallop mixture into them.
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10
Put the salmon mixture into a piping tube and pump the mixture into the center of the mold (or simply pour mixtures into the mold.)
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11
Place the ramekins or molds in a shallow pan containing 1 inch of water; cover the pan with aluminum foil pierced with small holes to allow steam to escape.
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12
Bake in a 350F (180C) oven for 30 minutes.
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13
For the Sauce: Put the shallots, vinegar, and wine into small saucepan and cook until half of the liquid is gone.
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14
Add cream and bring to a boil, then whip.
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15
Add butter in small pieces and whisk over medium heat.
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16
Remove from heat and adjust the seasonings.
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17
For the Garnish: Saute spinach and watercress in butter for 1 minute.
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18
On hot serving plates, arrange some of the spinach and watercress in small circles the same size as the ramekins or molds.
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19
Unmold the scallop-salmon mousse onto the vegetables, top with sauce(s).