I am not sure specifically - but I think the "usual" recipe is vanilla. If you want, you could add some extra vanilla to really get a stronger "vanilla" flavor. I personally like a good quality vanilla better - at least definitely not imitation vanilla flavor (like the clear stuff). But, "real" vanilla will turn your frosting slightly ivory depending on how much you use.
I use the Buttercream Dream recipe from this site, which calls for quite a bit of vanilla. It has a strong vanilla flavor. I also use pure vanilla extract, which I think has a stronger flavor than imitation.
I imagine you could add vanilla extract to any bc recipe.
I have this awesome recipe. It is so good! And if you have trouble finding vanilla beans where you are, I got mine from a health food store.
http://www.oprah.com/foodhome/food/recipes/food_200504_vbfrost.jhtml
Sorry to get off subject but I make my own vanilla.
Rub four vanilla beans with the dull edge of a knife to evenly distribute the beans. Then cut the beans in half lengthwise and place in a bottle of vodka. Seal the bottle and put in a cool, dark place for four to six months. Shaking the jar occasionally until the flavor of the extract has mellowed.
Takes some time but is great and I can make it in half gallon jugs of vodka so I always have plenty.
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