Chocolate Cornstarch Pudding

Recipe and picture from www.allrecipes.com

INGREDIENTS
1/2 cup (100g) white sugar
3 tablespoons unsweetened cocoa powder
1/4 cup (30g) cornstarch
1/8 teaspoon salt
2 3/4 cups (650ml) milk
2 tablespoons margarine or butter
1 teaspoon vanilla extract

DIRECTIONS
1. In a saucepan, stir together sugar, cocoa, cornstarch and salt. Place over medium heat, and stir in milk. Bring to a boil, and cook, stirring constantly, until mixture thickens enough to coat the back of a metal spoon.
2. Remove from heat, and stir in margarine and vanilla. Let cool briefly, and serve warm, or chill in refrigerator until serving.