Instructions

1 In a saucepan, stir together the white sugar, cream of tartar and water. Bring to a boil over medium-high heat, and cook without stirring until the temperature is between 223 and 234 degrees F (106 to 112 degrees C), or until a small amount of syrup dripped from a spoon can spin a long thread.

2 When the syrup comes to the proper temperature, remove from heat, and stir in confectioners’ sugar about 1/2 cup at a time until the icing is thick enough to coat a metal spoon. Test by pouring over a small piece of cake. Adjust the amount of confectioners’ sugar as needed to get a good pouring consistency. Use while warm, or reheat over simmering water. Keep covered with plastic wrap when not in use to prevent a crust from forming on the top.