Chocolate Pastry Cream

Bahan-bahan (2 porsi)

• 2 cups whole milk ()
• ½ cup sugar
• 1/4 cup cornstarch
• 1/4 teaspoon salt
• 4 large egg yolks
• 4 ounces semisweet or bittersweet chocolate, finely chopped
• 2 tablespoons unsalted butter, cut into ½-inch cubes
• 2 teaspoons vanilla extract
• 1 tablespoon rum or coffee liqueur (optional)