Quick Answer
Yes, you can make yogurt without a thermometer, but you'll need to use a different method to ensure the milk reaches the ideal temperature for fermentation.
Using the Stovetop Method
To make yogurt without a thermometer, you can use the stovetop method. Bring the milk to a boil, then reduce the heat to a simmer and let it cook for 5-7 minutes. This will heat the milk to around 180-185°F (82-85°C), which is suitable for fermentation. Alternatively, you can use a candy thermometer or a cooking thermometer, which are more accurate but not essential.
Monitoring Temperature with a Water Bath
Another method is to use a water bath to heat the milk. Fill a large bowl with hot water, and then place a smaller bowl with the milk inside. Stir the milk occasionally until it reaches the desired temperature. This method is more energy-efficient and allows for more precise control over the temperature.
Testing for Temperature with a Drop Test
If you don’t have any thermometer, you can use a drop test to estimate the temperature. Drop a small amount of milk into a cup of cold water. If it forms a soft ball that flattens when removed from the water, the milk is around 160°F (71°C), which is suitable for fermentation. If it forms a firm ball that holds its shape, the milk is too hot.
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