Vanilla Pastry Cream

Bahan-bahan (2 porsi)

• 2 cups whole milk ()
• 2 teaspoons vanilla extract or vanilla bean paste
• ½ cup sugar
• ¼ cup cornstarch
• ¼ teaspoon salt
• 4 large egg yolks
• 2 tablespoons unsalted butter, cut into ½-inch cubes
• 1 tablespoon rum (optional)