Make your own yogurt. I have made this ad infinitum times and it always turns out well. I usually make it just before bed then it is ready in the morning.
- 4 cups pasteurized milk (I use skim milk)
- 2 tbsp. live culture yogurt, room temperature (see notes)
- 1/3 cup dry milk
- large glass bowl
- thermometer (see notes)
- finished yogurt containers (I use one pint glass mason jars with plastic lids)
1. Sanitize the glass bowl, thermometer, and ygurt containers. I soak them in boiling water for a few minutes (dip the thermometer probe to sanitize it). I have made the yogurt successfully without this step but I'm taking a chance. Yogurt can get cross-contaminated with wild yeast in the air.
2. Commercially sold milk is pasteurized. Read the label.
3. Make sure the starter yogurt has live cultures in it. Some yogurts have been pasteurized which would kill the live cultures.
4. Mix the dry milk in the pasteurized milk.
5. Heat milk in glass bowl in microwave until 180 degrees (about 14 minutes). Gently stir after 5 minutes so skin does not form on top of milk. This is necessary to change the milk structure so the milk proteins set together rather than clump to form curds and whey. Let sit 5 minutes.
* If using yogurt as a starter, make sure it is room temperature.
6. Cool to 110 degrees. I put milk bowl inside a larger one (or a sink filled part way with water) filled halfway with cold water. It cooled in about 15 minutes.
* Mix in 2 tbsp of cooled milk with yogurt starter to make a slurry.
7. Pour yogurt slurry into milk and gently stir for 1 minute.
8. Cover. If the bowl does not have a hat, use a plate.
9. Incubate mixture at 110 degrees F until set, about 8 to 12 hours. I use an electric oven with oven light on (heats up to about 93 degrees F but it does work). I preheat the oven with the oven light. I use an oven thermometer to monitor temperature. I wrap the warm bowl with a big towel before placing in the oven. See below for more methods.
* Let the yogurt cool off for 2 hours before refrigerating.
10. Refrigerate for at least 6 hours then strain if you want.
11. Divide up into containers and keep refrigerate. I use 1 quart mason jars with screwtop lids. Keeps at least one week.
I have had success in making double or triple batches. Since the oven light is on, having two or three bowls of yogurt helps maintain the incubation temperature.
To get Greek yogurt effect, strain in the refrigerator for 2 hours. The leftover liquid (whey) is very nutritious. I use it in place of water or milk in homemade bread. The longer the thicker. I left a batch overnight and it was very thick.
Mix in flavorings, if necessary. Try 1/2 tbsp vanilla extract or 2 tbsp honey.
Very fine mesh strainer. (this is what I use). I place the strainer over a 1 quart yogurt container and cover. I generally wait 1/2 to 1 hour. I use the left-over whey in other recipes, such as bread or pizza dough.
2. cheesecloth in a colander
3. I have heard that paper coffee filters do not work well because they saturate and tear; I have not tried them.
4. Tightly woven tea towels.
Store whey in a clean jar in the refrigerator, where it should last for months.
There are a lot of ways to incubate yogurt mixture.
- Put in electric oven with oven light on. If you have a remote sensor thermometer with alarm, you can set the alarm to ring at 113 degrees so the mixture does not kill off the cultures. This is my preferred method as it is the most controllable. Mine heats up to 93 degrees.
- Buy a commercial yogurt maker.
- Put mixture bowl on heating pad, cover with inverted pot, and set pad to low.
The original yogurt is a little thin though straining it will thicken it up. If you don't want to wait for straining, mix in a little gelatin.
Use a quality nonfat, plain yogurt from the store. Once the first batch is made, save a few tablespoons for the next batch. I have read that the starter yogurt should be replaced every 5 or 6 batches with a commercial one, though I have not done this. I'm not sure of the ramifications.
One thing to try is using whey as a starter. I have not tried it, but will soon.
The yogurt has a shelf life in a refrigerator of 10 to 21 days.
How does it work
- Yogurt is stringy
- Yogurt is watery
- My yogurt separated into solid and liquid layers (curds and whey). What happened?
- Separation is usually an indication of overculturing or culturing at too warm of a temperature. Adjust the length of culture time and check the culturing temperature to make sure it is within the appropriate range.
- My yogurt looks lumpy and curdled. What did I do wrong?
- If the flavor is pleasant, but the texture is grainy or gritty, it often indicates that the milk was heated too quickly. Heat milk slowly to avoid this issue.
- Why is my yogurt bitter?
- Store-bought yogurts generally contain thickeners. Drain whey or add thickeners to homemade yogurt to achieve similar thickness.
- Why is my yogurt too sour or not sour enough?
- Culturing temperatures on the higher end of the range and longer culture times will yield a more sour flavored yogurt. To achieve a less sour flavor, culture at the lower end of the range or for a shorter period of time.
- Why is my yogurt foamy (or stringy) and yeasty-smelling?
- This issue is generally caused by cross contamination from yeast, which can come from a sourdough starter culturing too closely, or wild natural yeast that has come in contact with the yogurt. To avoid this problem, be sure to clean all equipment, utensils, counters and other materials used in the yogurt-making process.
- What is the difference between mesophilic and thermophilic yogurt starter cultures?
- Mesophilic cultures at room temperature, 70º-77ºF. Thermophilic cultures at approximately 110ºF.
- Will my yogurt culture better or have more probiotics if I use more than one packet? Can I use more starter culture to achieve a thicker yogurt?
- Do not use more starter than recommended. Using too much starter can crowd the bacteria, causing the bacteria to run out of food before the yogurt completely ferments the milk. The result is often a thinner, sometimes bitter, yogurt.
- Why do I have to heat pasteurized milk when using thermophilic cultures?
- Heating the milk to 160ºF will kill any bacteria present in the milk that might compete with bacteria in the thermophilic cultures.
- Why do you recommend culturing no more than ½ gallon of yogurt per batch?
- With that much liquid, it is difficult to keep temperature consistent. If culturing a thermophilic at 110ºF, the outer portion is likely to be warmer or the center will never be warm enough. For mesophilic cultures, it takes a long time for milk come to room temperature and for the culture to begin working while the milk bacteria is building fast and can compete with the yogurt culture.
- Can I use milk made from powdered milk to make yogurt?
- Many customers have had success using a high quality powdered milk, such as Capramilk, for culturing yogurt. Other powdered milk brands are highly processed and may not perform well.
- Why do I need to cool my yogurt at room temperature for 2 hours before refrigerating?
- Giving your thermophilic yogurt some time at room temperature allows for a slower cooling process than placing it directly in the refrigerator.
- When can I flavor my yogurt?
- To avoid interfering with the culturing process, it is best to flavor after the culturing process is complete. This is most important when working with heirloom cultures.
- How long will finished yogurt last in my refrigerator?
- In the refrigerator (40° to 45°F): 7 days to maintain re-culturing viability; 2 weeks for edibility.
I use an instant thermometer. While cooling, it is handy to have a remote thermometer with an alarm on it so you do not have to hang around. A remote thermometer with probe in yogurt mixture would be ideal so the incubation temperature can be monitored.
I use this yogurt in place of buttermilk in many recipes.
The dry milk adds milk solids which help thicken the yogurt.
If the yogurt incubates too long, it will get tart.