As I posted in another thread recently, real buttermilk is milk that has had the butter removed, and it's a tangy cultured product, in which the lactic acid chemically changes the batter for pancakes and the dough for biscuits in a way that makes them turn out fluffier and lighter. The imitation buttermilk sold in most dairy cases is not nearly as wonderful.
Using butter in the recipe will give them more of a butter taste, natch.
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