Homemade Yogurt

Put heavy cream into heat-proof container, and put in a pot of simmering water which comes about half-way up the sides of the container. Simmer the cream for 20 minutes. Remove the jar from the water and allow to cool to room temperature. Stir in plain yogurt, making sure it has live culture. Cover and leave at room temperature for 48 hours. Refrigerate.

I used vanilla syrup, and this was excellent. It was very rich, though, and I would probably use whole milk next time. (The yogurt culture converts the lactose in the milk to lactic acid, and thereby "eats" some of the carbs. One cup of yogurt made with milk has about 4 carbs, rather than the 11-12 that is listed on the container of milk.)