any unit used in linear measurement, as the inch, foot, meter, etc. Origin of linear measure. 1885-1890. First recorded in 1885-90.
Realistically, you could put any icing you wanted on a carrot cake. The wonderful beauty of cooking is that you can make it to your liking. But, the traditional icing that most people put on carrot cake is cream cheese icing.
Smooth Buttercream Frosting. Getting the frosting smoothly on your cake is the key to a professional looking cake design. The method I use to achieve smooth frosting is called the Viva method. I don't know who originally came up with this method. If I ever find out I'll give them a big hug.