Fudge Frosting - cooking recipe

Ingredients

3 tablespoons unsweetened cocoa
3 2/3 tablespoons cornstarch
1 cup granulated sugar
1 pinch salt
1 cup strong black coffee
1 tablespoon butter
1 teaspoon vanilla extract

Preparation

Mix cocoa, cornstarch, sugar and salt together in a bowl.
Heat coffee in a medium saucepan.
Add butter to the coffee to melt. Stir until well blended.
Add cocoa mixture and simmer over medium-low heat, stirring constantly with a whisk, until mixture has the consistency of pudding (about 7 minutes).
Remove from heat and stir in the vanilla.
Allow frosting to cool for five minutes, stirring occasionally.
Use the frosting when it is still tepid; do not allow it to become too stiff.