Put all the dry ingredients in a bowl, and mix them together. (The bicarbonate of soda, and the vinegar will react if mixed together, so don't put everything in all at once.)
Put the remaining ingredients into the bowl, and beat together, until thoroughly smooth. (It should have a fairly thick consistency, so you may wish to hold back on putting all the milk in at once.)
Pour small helpings into a frying pan greased with butter. (Start with the pan around 380° F, then turn it down low.)
You can probably leave out the bicarb. I think this recipe was originally using plain flour, and it'd use it to make them rise. Some people find it leaves a bitter taste, and they do cook fine without it.
If you're wondering what I mean by the reaction between the bicarbonate of soda and vinegar, then drop a bit of both onto the counter top, and watch it fizz.
This is safe, but would probably taste awful if you let them mix this way in the batter. The vinegar is really in the recipe instead of using sour milk, which I don't even like the thought of (how do you determine the difference between milk turing sour, and it going off?).