Puding Vanila buatan sendiri

Bahan-bahan (4 porsi)

• ½ cup granulated sugar
• 3 tablespoons cornstarch
• ¼ teaspoon salt
• 2 ¼ cup whole milk
• 2 large egg yolks
• 2 tablespoons unsalted butter
• 1 ½ teaspoons vanilla extract