======Making Yogurt====== **Materials: **{{$demo.materials_description}}\\ **Difficulty: **{{$demo.difficulty_description}}\\ **Safety: **{{$demo.safety_description}}\\ \\ **Categories:** {{$demo.categories}} \\ **Alternative titles:** Yogurt Fermentation ====Summary==== {{$demo.summary}} ====Procedure==== - Warm 2 pints of milk in a cooking pot over low heat, stirring often, until it reaches about 88°C or just starts to bubble. - Place the pot into a bowl of ice water to cool the milk quickly to about 46°C, or until it feels just warm. - Pour half a cup of the warm milk into a small bowl and mix in 2 teaspoons of plain yogurt with live cultures. - Return this mixture to the main pot and stir thoroughly to combine. - Carefully pour the mixture into a clean glass mason jar and screw on the lid. - Wrap the jar in a towel and place it in a warm location (e.g., on top of a refrigerator) for 10–12 hours. - After incubation, check the yogurt’s thickness and tanginess; longer incubation produces stronger flavor. - Refrigerate and enjoy with fruit, honey, or granola. Save 2 teaspoons from this batch to use as starter for the next one. ====Links==== How to Make Yogurt with Kids - Children's Museum and Theatre of Maine: {{youtube>G-CNhymP_Z8?}}\\ 📄 How to make homemade yogurt - AUTHOR: [[https://www.natgeokids.com/au/kids-club/cool-kids/general-kids-club/how-to-make-homemade-yogurt/]]\\ ====Variations==== * Try different types of milk (whole, skim, plant-based alternatives) and compare texture and taste. * Test how incubation time affects thickness and tanginess. * Add fruit or flavorings after incubation for variety. * Compare results using yogurt starters from different brands. ====Safety Precautions==== * Heat milk carefully and stir constantly to prevent scalding. * Use oven mitts when handling hot pots and jars. * Keep all containers and utensils clean to avoid contamination. * Refrigerate yogurt promptly after fermentation and consume within two weeks. ====Questions to Consider==== * What role do bacteria play in making yogurt? (They ferment lactose into lactic acid, which curdles milk proteins.) * Why is it important to cool the milk before adding the live yogurt cultures? (High temperatures could kill the bacteria.) * How does incubation time affect the yogurt’s taste and texture? (Longer incubation produces thicker, tangier yogurt.) * Why should new batches of yogurt be started with live cultures from a previous batch? (The live bacteria continue the fermentation process.)