• 4 cups whole milk
• 1/4 cup plain whole milk yoghurt

Heat milk in a saucepan over medium heat to 203°F. Pour into a sterilized glass jar and allow to cool to 108°F.
Stir in the yoghurt and cover with a tight fitting lid. Place in a cool oven for 8-12 hours or until thickened.

Makes about 4 cups.