How to Make Yogurt

1
How to Make Yogurt

• Adapted from
• YOGURT MAKING ILLUSTRATED
• David B. Fankhauser, Ph.D.  Professor of Biology
  and Chemistry  U.C. Clermont College  Batavia
  OH 45103

2
Yogurt

• A thick, custard-like, mildly acid food.
• Usually made by fermenting partly skim or skim
  milk with a starter culture (bacteria).
• Fruit or other flavorings may be added.

3
Step 1

• Sterilize the jars and lids, to be used to make
  the yogurt.
• Place jars and lids in a five gallon pot -- such
  as a boiling water bath canner and completely
  immerse in water.

4
Step 2

• Cover and bring to boil.
• Boil for ten minutes.
• Turn off heat, do not remove lid.

5
Step 3

• Use a pot with a thick bottom to bring milk to a
  boil.

6
Step 4

• Add one gallon of milk to the pot.
• Use 2 or skimmed milk.

7
Step 5

• Warm the milk over medium heat.
• Do not use high heat as the milk might burn on
  the bottom.

8
Step 6

• Heat the milk to 185oF-195oF.
• Do not let boil.

9
Step 7

• Place the still covered pot in a pan of clean
  cold water to cool it down.

10
Step 8

• Cool the milk to 122oF 130oF.
• Remove the pot from the cold water.

11
Step 9

• Place one cup of the cooled milk in a two cup
  measure.

12
Step 10

• Add enough fresh yogurt to bring the level up to
  two cups.

13
Step 11

• Stir to blend the yogurt starter into the cooled
  milk until it is homogeneous.

14
Step 12

• Add the yogurt-milk slurry slowly to the cooled
  milk with stirring.
• Stir very well to thoroughly distribute the
  yogurt starter.

15
Step 13

• Once thoroughly mixed, distribute the inoculated
  milk to the sterilized jars, filling to the neck.
• Cover immediately with sterile tops.
• Tighten well.
• Avoid hand contact with milk to avoid
  contamination.

16
Step 14

• Warm a gallon of fresh clean water to 131oF, pour
  into a clean cooler.
• Place in a warm location.
• Carefully set the jars of inoculated milk in the
  water so the bottom of the lids are above the
  water.

17
Step 15

• Check to see that the water in the cooler is not
  below 122oF or above 130oF.

18
Step 16

• Let sit undisturbed for three hours.