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For custard filling, in a small heavy saucepan, mix sugar, cornstarch and salt. Whisk in milk. Cook and stir over medium heat until thickened and bubbly. Reduce heat to low, cook and stir 2 minutes longer. Remove from heat. In a small bowl, whisk egg yolks. Whisk a small amount of hot mixture into egg yolks; return all to pan, whisking constantly. Bring to a gently boil; cook and stir 2 minutes. Remove from heat. Stir in butter until melted. Immediately transfer to a clean bowl; stir in vanilla. Cool 30 minutes. Press plastic wrap onto surface of filling; refrigerate until cold.
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Whisk custard gently. Fold in half of the whipped cream, then fold in remaining whipped cream. Cover and refrigerate.
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Make the dough while the custard is chilling. In a large bowl, mix sugar, yeast, salt and 1 cup flour. In a small saucepan, heat milk and butter to 120 to 130 F. Add to the dry ingredients; beat on medium speed 1 minute. Add eggs, beat on high 1 minute. Stir in enough remaining flour to form a soft dough (dough will be sticky).
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Turn dough onto a well-floured surface; knead until smooth and elastic, 6 to 8 minutes. Place in a greased bowl, turning once to grease the top. Cover and let rise in a warm place until doubled, about 1 hour.
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While dough is rising, make almond topping. In a small saucepan over medium heat, melt butter, honey and sugar. Cook and stir until sugar is dissolved. Remove from heat; stir in almonds. Cool slightly and set aside.
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Punch down dough. Transfer to a greased 9 inch springform baking pan, pressing to evenly fill pan with dough. Spoon almond mixture over dough and gently spread to cover entire surface. Cover pan with kitchen towel; let rise in a warm place until doubled, 25 to 30 minutes.
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Preheat oven to 350 F. Bake until topping is golden brown, 25 to 30 minutes. Cool on wire rack 10 minutes. Loosen side from pan with a knife. Cool 1 hour longer.
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Remove cake from base of springform pan. Using a long serrated knife, cut cake horizontally in half; spread filling over bottom layer. Replace top of cake. Serve immediately. Chill leftovers.