Step 1

Use a scale for accuracy. Combine all ingredients into a clean, wide mouth jar. Stir vigorously until it forms a smooth paste.

Step 2

Cover your apple starter with a paper towel secured with an elastic band or a loose fitting lid and set aside to allow fermentation to occur. If it seems slow, give it a stir after a few hours. It should double within 10 hours (as long as you've used an established sourdough starter).

Step 3

Use your apple sourdough starter in your favorite sourdough recipe. You can continue to feed your apple sourdough starter using the measurements above. It's up to you whether you just build this starter when you require it - or double the mixture and use half and put half in the fridge. You can then just take it out and feed it as you need it.