Vanilla Custard Slice

Vanilla Custard Slice

• 2¼ cups (281 grams) all-purpose flour
• 2½ teaspoons (7.5 grams) kosher salt, divided
• 1¼ cups (284 grams) cold unsalted butter, cubed
• ½ cup (120 grams) ice cold water
• 4 cups (960 grams) whole milk
• 1⅓ cups (266 grams) granulated sugar, divided
• 2 Heilala Vanilla Beans, split lengthwise, seeds scraped and reserved or 2 teaspoons Heilala Vanilla Paste
• 10 large egg yolks (186 grams)
• ½ cup (64 grams) cornstarch
• ¼ cup (57 grams) unsalted butter, softened
• Garnish: confectioners’ sugar