Grandma's Chocolate Frosting
|Unsweetened cocoa powder||2 Tablespoon|
|Granulated sugar||1⁄2 Cup (8 tbs)|
|Hot water||1⁄2 Cup (8 tbs)|
In 4 cup (1 L) microproof measure stir together cocoa, sugar, cornstarch and salt.
Stir in water and cook on HIGH for 2 minutes or until mixture boils and is thickened.
Stir in butter and vanilla.
Let stand until cool, stirring occasionally, before using to ice cake.