Chocolate Pudding

Source: http://smittenkitchen.com/2009/09/chocolate-pudding-pie/

Pudding filling:
1/8 cup cornstarch
35 g sugar
1.5 tablespoons unsweetened cocoa powder
1/4 teaspoon salt
1.5 cups milk
2 ounces bittersweet chocolate (not more than 60% cacao), finely chopped
.5 teaspoon pure vanilla extract
Instant coffee

Whisk together cornstarch,sugar, cocoa powder, and salt in a 2-quart heavy saucepan, then gradually whisk [tips alert!] in milk. Bring to a boil over medium heat, whisking constantly, then boil, whisking, two minutes (mixture will thicken). Remove from heat and whisk in chocolate and vanilla until smooth.

Notes: The texture of the pudding will change (thicken!!) when the chocolate is added to it, so do NOT overcook it on the stove.