* 500ml whole milk
1. Pour the milk into a saucepan and whisk in the dried milk powder. Put the pan over a medium heat, stand a cooking thermometer in it and stir gently, watching the thermometer carefully, until the temperature reaches 46°C.
2. Take the saucepan off the heat and pour the milk into a warmed mixing bowl. Check the temperature hasn't gone beyond 46°C. If it has, stir the milk until the temperature drops back. Whisk in the live yoghurt. The bacteria within it will start to work on the fresh milk, converting it into yoghurt.
3. Cover the bowl with a lid or some cling film, wrap it in a towel and put it somewhere warm - in an airing cupboard or above a radiator are good places. Alternatively, you can pour the mixture into a warmed, wide-mouthed Thermos flask and seal.
4. Check the yoghurt after 6-8 hours, or leave it overnight. If it's still runny, leave it wrapped up in the warm for another 1-2 hours. When it has thickened and looks set, pour it into a clean container, seal and refrigerate. Homemade yoghurt isn't as thick as commercial varieties. If you’d like a thicker finish, you can strain the yoghurt through a muslin-lined sieve over a bowl in the fridge for a few hours.
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