- In a small saucepan over medium heat, stir together the butter and water until the butter melts. Remove from the heat and let stand until cool, about 5 minutes.
- Add the sugar to the butter mixture and whisk vigorously until smooth and thickened, about 1 minute. Use the icing within 5 minutes or it may become too thick to drizzle. If the icing does become too thick, rewarm it for 2 or 3 seconds over low heat, whisking constantly. Makes a scant 1/2 cup.