Easy Yogurt

Preparation

1. Step 1

   Evenly coat the bottom of a medium Dutch oven or other heavy-bottomed pot with a thin, ¼-inch-thick layer of water. (This will prevent the milk from sticking to the bottom of the pot.) Set the pot over high heat. Add the milk and heat until it just comes to a boil, watching closely: As soon as you start to see bubbles forming, take the pot off the heat. Let the milk cool until it reaches 130 degrees, 30 to 35 minutes. If you don’t have a thermometer, the milk should be warm enough that you can comfortably stick your (clean!) finger in it — it should feel hot, but not so hot as to scald your finger (think of a Jacuzzi).

2. Step 2

   While the milk is cooling, smear the bottom of a 1-quart lidded glass, plastic or stainless steel container with 1 teaspoon of the yogurt. (A dab in the center is fine; you needn’t spread the yogurt evenly to coat the bottom.)

3. Step 3

   When the milk has cooled to the proper temperature, add the remaining yogurt to the milk and whisk until the yogurt has completely dissolved into the milk, about 3 minutes. Pour the mixture into the prepared container and loosely set the lid on top, leaving a little room for air to get out.

4. Step 4

   Place the container inside an unheated oven. Shut the oven, turn the oven light on and let sit for 2 hours (see Note). Check the yogurt: When it is done, it will be set (not liquid) but still jiggle like Jell-O. If it’s not yet set, leave it in the oven for 1 hour more. Depending on the temperature and humidity outside, the setting process can take up to 5½ hours, so don’t fret if the yogurt isn’t done the first time you check.

5. Step 5

   When the yogurt is done, top it with the lid to seal, and transfer the yogurt to the refrigerator to chill and fully set overnight before using. The yogurt will keep, covered, for 4 to 6 weeks. (It’ll start to get pretty sour after 2 weeks, which, depending on your tastes, could be a good or bad thing. You can also freeze a few tablespoons to start a later batch.)