neapolitan cake

INGREDIENTS

• 1 1/4 cups sugar
• 1 1/2 cups jam, raspberry, apricot, strawberry or peach are suggested, but I used currant jam, which I strained
• Half of a vanilla bean, split lengthwise, seeds scraped
• Salt
• 1/2 tablespoon lemon juice
• 1 cup whole blanched almonds, toasted
• 3 cups flour, sifted
• 1 cup unsalted butter, at room temperature
• Finely grated zest of 1 lemon
• Finely grated zest of 1 orange
• 4 large egg yolks, at room temperature
• 1/2 teaspoon almond extract
• 1 teaspoon orange-flower water (I skipped this)
• 1/4 cup sliced almonds, toasted