Preheat oven to 350. Grease pans. (I usually use heart shaped ones) =)
In small bowl, sift flour, salt & soda together. Add the cocoa powder.
In larger bowl, beat butter & sugar together. Add one egg at a time. Beat until smooth
Add wet ingredients to egg mixture. At low speed, add a little (about half a cup) of flour mixture at a time.
Bake 35-40 minutes for cake, 20-30 minutes for cupcakes ;)
***(a good substitute for buttermilk is 1/4-1/2 Tbsp (or even 1/8 of a cup if that's easier for you to measure) of lemon juice + the remainder of the cup of milk... let sit for a few minutes, stir then add)