1/2 stick butter/margarine
Set margarine in the frying pan to melt. Mix dry ingredients in one bowl, wet in another. Add the melted butter to the wet and mix well just before stirring in dry stuff. If you want skinnier pancakes, thin batter with more beer.
You might want to make a double batch, as this leaves 1/2 a container of bland beer sitting around, and I for one don't drink before breakfast, and if I did, I wouldn't drink this stuff.
If the beer isn't flat, you can reduce the baking powder and soda. The lemon juice is just to react with the soda, so that can go away too. If you use fresh beer, the above makes very light and fluffy pancakes.