- Amount of commercial yogurt to use as a starter
If you are making 2 quarts of half and half yogurt, use about
half a cup of commercial yogurt. In other words, about 1/4 cup per
milk no matter what kind. In the French cream recipe which I got out
Julia Child's book, it did stipulate more. I never really gave it much
thought but even if you double up on the amount of commercial yogurt
your yogurt, it will be fine and, maybe, even better.