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Okay, fine, I will put the US measurements in at the recipe at the end of the post.
I am not a frosting fan. Really. I prefer my desserts unadulterated because frankly, I can't stand the sweetness. However, I do realize that there are those who cannot eat a sugar cookie unless it is accompanied by a thick layer of rich, sugary buttercream-style frosting. For all of you people out there who fit into this category, don't despair: this recipe will fulfill your needs.
Before I get into how to make it though, a couple comments first. You may notice that while most recipes call for using only butter, I use a combination of butter and shortening. The reason for this is because of fat melting points. Butter melts at a relatively low temperature, which means that on a warm day your frosting will begin to melt and "curdle." Shortening melts at a higher temperature, much above body temperature, so it will allow the frosting to hold it's shape even on warm days. So if shortening is so much better, why use butter? FLAVOR!! Even the best shortening can never beat butter for taste.
Secondly, this recipe differs in that it doesn't require the sifting of the powdered sugar. The way I see it, you will whip the frosting until smooth, so any possible lumps in your sugar will get beaten out anyway. And sifting powdered sugar just makes a huge mess.
Third, this recipe does not include food coloring. I have a good reason for this, and it has nothing to do with any possible health effects of food coloring. I didn't include it because I don't know what type you will have, and the type of food coloring plays a huge role in the final texture of the frosting if you don't know what you are doing. I prefer using powdered food colors because they huge only a marginal effect of the final frosting, and it is easier to get a vibrant color from a powder. Gels and liquids mean that you will have to either add more sugar to the recipe or reduce the amount of liquid in the recipe. So, any will work, but you have to pay attention to what you are doing.