Homemade Buttermilk!

I am always looking for homemade ways to make things and buttermilk is something that I have found on many sites that claims it to be easy, so I decided to go ahead and try it! I love making pancakes from scratch and have found this recipe to be the best I have found so far, but like to substitute the regular milk for buttermilk and find they come out even better! I ended having about 2-3 tbsps of buttermilk leftover from a quart I purchased last week for pancakes, which happens to be the perfect amount to culture a qt of milk into buttermilk! All I did was add the couple of tablespoons of store-bought cultured (this is important!) buttermilk to the bottom of a glass, quart-sized mason jar and then filled it up with regular whole milk. I put it into a dark cabinet and left it to sit overnight or so. I checked it and it didn't seem quite done, so I put it back and forgot about it, let it sit for another day or so (my pregnant brain doesn't remember the actual day I put it up there!! LOL) and when I finally remembered it thought it was done, I smelled it, had my oldest smell it and when my hubby got home had him smell it also. He said it smelled fine :)
I decided to try it this morning in our pancakes and none of us are sick yet they turned out great!

BTW my Sourdough starter is progressing nicely! I can't wait for it to be done so I can try it out!