Sift the sugar into a bowl, then add the vanilla extract. Gradually stir in the hot water until the mixture is the consistency of thick cream. Cover each brownie with icing.
Make a second batch of icing, this time adding a few drops each of red and yellow food coloring until the icing is orange. Put the icing into a piping bag (if you don't have a piping bag, you can put the icing into a plastic bag and cut a very small hole in the bottom corner). To make a cobweb design: make fine, concentric circles with the colored icing starting from the center and working outwards. Using a toothpick, pull the colored icing from the center to the outside edge, dividing the brownie into quarters then repeat to divide into eighths.
Call us! We have all the answers (about brownies).