Friday, February 22, 2008

Making Yogurt, sort of

I used a combination of recipe/ advice in making yogurt. I took the basic method from Simply in Season, but used the more comprehensive discussion from Super Baby Food to inform what I did.
The S in S recipe suggests using a 2 quart (64 ounce) Thermos to keep the yogurt warm while it is incubating. So make sure you have one of those handy. Mine happens to be 3/4 the size recommended in the recipe, so I adjusted amounts accordingly. You, of course, can do the same. You will also need a candy themometer -- a themometer that can clip onto the side of a pot.

Step One:
Heat a big pot of water to boiling to sterilize the spoon, pot and thermometer you will use. Keep it at a low boil to use in a later step.
Step Two:
Pour out eight cups of milk. I chose to use raw milk despite Angela's warnings. I knew I would be trying to grow bacteria, which I hoped might have more of a chance in raw milk. I also knew I would be heating it, which supposedly kills off harmful bacteria. You could find all sorts of Web pages proclaiming the benefits and/or detriments of raw milk and/ or raw milk yogurt. I just wanted to give it a try. My raw milk comes from Frank White http://agmap.psu.edu/Businesses/3280 in Monogahela.


Step Three:
Heat milk in a saucepan to 185 degrees. Stir constantly and use low heat. The milk should not boil. Scald the milk, which means let tiny bubbles form on the outer rim of the milk where it touches the sides of the saucepan. I used a candy themometer to help me estimate the correct temperature.
The book suggested pouring the milk into another container after it reaches 185 degrees. I skipped that and just turned off the heat and left the themometer in until the themometer and the milk reached about 112 degrees.

Step Four
Pour boiling water into the Thermos and close the lid.

Step Five
Measure four tablespoons, i.e. 1/4 cup, of yogurt "starter" so that it can rise to room temperature. Yogurt starter is yogurt with live, active yogurt cultures. The books suggested using store bought yogurt for your "starter."
Also, according to the suggestion, I froze one tablespoon portions of fresh, store-bought yogurt in an ice cube tray. After they were frozen, I then emptied the yogurt cubes and put them in a freezer-safe plastic zipper bag and put them back in the freezer to use later.

Step Six
When the milk has cooled to 112 degrees, add the "starter" to it and stir.

Step Seven
Pour the water out of the Thermos and pour in the milk and yogurt combination. Close it up tight and put it someplace warm. Maybe wrap it in a blanket or heating pad or something and then don't move it for four to six hours.
It was tricky for me to keep the yogurt warm. It is supposed to incubate at 110-115 degrees for hours. In truth, I have no idea what the temperature was. I did not want to open the Thermos and let out any heat. Our house has plenty of cold spots and very few warm ones, so I put the Thermos in front of the warmest spot in our house.

Step Eight
After carefully maintaining a temperature of 110-115 degrees for 4 to 6 hours check on the yogurt. When you feel it is thick enough, it is done. If you leave it for longer, it can get more sour and you should add additional sweetener. In my case, I had to go to do kid stuff and just stopped the process at 4 1/2 hours. The result was less than ideal.

The yogurt seemed runny to me. Probably because 1) raw milk does that and 2) I don't think I let it incubate long enough and 3) it may not have been at a warm enough temperature.

At this point, you can add honey and fruit or whatever, but stir it gently. Good luck. It's not hard to get a taste and smell like real yogurt, but in my brief experience, it is more difficult to get the right consistency.

4 comments:

Angela said...

Alton Brown has a recipe that uses a little dry non-fat milk as a thickening agent. It is an ingredient I see pretty often in commercial lowfat yogurts so it might be worth a try - except for the whole finding local dry milk part.

http://www.foodnetwork.com/food/recipes/recipe/0,1977,FOOD_9936_19495,00.html

Lori F. said...

You may want to add some organic dry milk powder to your mixture before incubation to make the yogurg thicker. I purchased mine online from Frontier Coop in 5 lb. bags. I make my own yogurt a lot in the spring/summer when I can take advantage of local fresh fruits. I follow the same directions but only heat my (pasteurized) milk to 160 degrees. Then I allow it to cool to 120 degrees and incubate for at least 8 hours. I place mine in a canning jar and wrap it in a heating pad and then cover with a bath towel. Sometimes it goes as long 10 to 12 hours and is still edible, just more tangy. This is certainly a cost savings over buying organic yogurt. When it is smoothie season I use a lot of yogurt!

Angela said...

I tried this today. I used pasteurized milk and the dry milk powder and let it go for about 8 hours. It was really, really runny. Of course, part of the problem was that the heating pad I was using has an auto-shut off after an hour. So every hour I had to remember to run down and turn the pad off and back on again to reset the timer. Sometimes I forgot so it probably dropped below 115 every now and then.

I also wonder if the source of the cultures makes a difference. The yogurt I was using for my starter has a pretty loose consistency. I'm going to try a different starter and see if I have better results.

Anonymous said...

Homemade yogurt tends to be a bit on the runny side. I don't mind it, but sometimes I drain it (like for Greek yogurt) to make a thick, creamy yogurt.

http://american-peasant.blogspot.com/2009/04/yogurt-all-by-yourself.html