Do we have any buttermilk experts here? I made some buttermilk using the link that HealthyBratt gave above and it smells right but it's super slimy! UGH! What did I do wrong? I just set it on top of the heater - where the temperature varies from probably 65-80 degrees. That's the warmest spot in the house. I'm thinking maybe I can still use it in recipes so it's not that big of a deal but I'm not sure if I should buy more store buttermilk for starter or just use the sli.....
I would pitch the slime and start fresh. I've found using bought buttermilk as starter is risky, sometimes it has the starting power and other times it is contaminated. The sliminess in my understanding is the result of some bad bacteria in there from either the starter,milk, or container/mixing process.
I'd also guess that the temp was a little warm. I find that much over 70 degrees is too warm. I much prefer a longer culturing time at a cooler temp. This gives it a smoother consistency.
If you want a basically foolproof starter, check out
www.cheesemaking.com Look for buttermilk under the direct set cultures. It is $5.95 for 5 packs of starter plus shipping. I have kept them two years in the freezer with no problems and counting... Although that company does not recommend reculturing I have successfully done it(approx. 1/4 cup per quart of fresh whole milk). I have to start a new culture every 6-9 months because of contamination/weakening culture. I make buttermilk every 2-3 weeks. I do home-pastuerize (145' F for 30 min.)the milk I use to ensure that my culture stays pure. This particular starter will make very thick buttermilk. If it is turning out too thick for your preferences, reduce the culturing time. Keep in mind that it will thicken after you put it in the fridge and that shaking it up will break up the curd a little and make it pourable.
The first batch you make will take longer to culture than subsequent batches.
I love buttermilk!!!