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In a food processor, chop nuts and 1/2 c. sugar until nuts are coarsely ground.
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Pour into a 9-inch tart pan with removable rim.
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In a microwave, melt 1/4 cup butter.
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Add melted butter to nut mixture and blend gently.
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Press mixture evenly over the bottom and up the sides of the pan.
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Set pan on a cookie sheet.
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Bake at 325° until crust begins to brown around the edges, about 20–30 minutes.
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Chop half the chocolate into 1/2" chunks and set aside. Finely chop remaining chocolate.
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In a glass bowl, combine remaining butter with finely chopped chocolate.
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Heat in microwave at 50% power until chocolate is soft. Stir until smooth.
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In a bowl with a mixer on high speed, beat egg yolks, 3 tablespoons sugar, cognac, and almond extract until mixture turns pale yellow, about 3 minutes.
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To egg yolk mixture, add chocolate-butter mixture and beat to blend.
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Stir in coarsely chopped chocolate.
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Pour into warm nut crust.
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Bake at 325° until filling barely jiggles when pan is gently shaken, about 15 minutes. Set on a rack to cool.
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To serve, remove pan rim and cut into wedges. Top with whipped cream.