Birthday Cake

INGREDIENTS

• butter for greasing pan(s)
• 14 ounces / 1 1/2 cups / 2 tubes of almond paste
• 5 large eggs, whisked
• 1 3/4 ounces / 45 g / scant 1/4 cup organic cornstarch
• scant 1/2 teaspoon fine grain sea salt
• 6 tablespoons / 1/3 cup / 80 ml unsalted butter, melted & cooled
• Buttermilk Glaze:
• scant 1 cup / 5 oz organic confectioners' sugar
• 2 tablespoons buttermilk
• the contents of 1/2 vanilla bean
• 3 tablespoons toasted almond slices