Core and roughly chop the apples (keep the skins on). Place in a large saucepan, add the water and ground cinnamon. Simmer for around 20 minutes, until the apples are cooked and soft.
Remove from the heat and allow to cool before blending to a smooth puree. Return the puree to the pan and simmer gently for approximately 25 minutes, until it thickens and darkens.
Allow to cool (the apple butter will continue to thicken as it cools), then pop into an airtight container.
Notes
Apple butter can be stored in an airtight container in the fridge for 2 weeks or can be frozen for up to 3 months. If you have plenty of apples, why not double up the recipe.
Per serving. Nutrition content in food is never consistent, so take these estimates with a pinch of salt! Also, our recipes tend to use low-GI carbs and sugars, so these values are not directly comparable with shop-bought UPFs.