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For terrine: Line 9x5x2 1/2-inch loaf pan with plastic wrap, allowing plastic to overhang edges by 3 inches.
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Place in freezer.
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Whisk first 3 ingredients in large metal bowl.
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Set bowl over saucepan of simmering water (do not allow bottom of bowl to touch water); whisk constantly until candy thermometer registers 160F, about 4 minutes.
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Remove bowl from over water.
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Add white chocolate; whisk until melted and smooth.
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Mix in peppermint extract.
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Whisk until cool and thick, about 3 minutes.
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Using electric mixer, beat cream in another large bowl until stiff peaks form.
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Fold cream into white chocolate mixture.
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Spoon mixture into prepared pan; smooth top.
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Cover and freeze overnight.
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For sauce: Combine first 3 ingredients in heavy medium saucepan.
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Stir over medium heat until butter melts.
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Add both chocolates and whisk until smooth.
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Mix in 3 tablespoons water.
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Remove from heat; cool slightly.
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(Terrine and sauce can be made 1 week ahead.
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Keep terrine frozen.
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Cover and refrigerate sauce.
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Before serving, stir sauce over low heat just until warm.)
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Turn frozen terrine out onto platter.
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Peel off plastic.
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Cut terrine into 3/4-inch-thick slices.
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Place 1 slice on each plate.
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Drizzle sauce over.
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Garnish with mint.