Day 1: To begin your starter, mix 50g flour with 50g tepid water in a jar or, better still, a plastic container. Make sure all the flour is incorporated and leave, semi-uncovered, at room temperature for 24 hrs.

Day 2: Mix 50g flour with 50g tepid water and stir into yesterday’s mixture. Make sure all the flour is incorporated and leave, semi-uncovered, at room temperature for another 24 hrs.

Day 3: Mix 50g flour with 50g tepid water and stir into yesterday’s mixture. Make sure all the flour is incorporated and leave, semi-uncovered, at room temperature for another 24 hrs.

Day 4: You should start to see some activity in the mixture now; there should be some bubbles forming and bubbling on top. Mix 50g flour with 50g tepid water and stir into yesterday’s mixture. Make sure all the flour is incorporated and leave, semi-uncovered, at room temperature for another 24 hrs.

Day 5: The mixture should be very active now and ready for making your levain (starter). If it’s not bubbling, continue to feed it on a daily basis until it does. When it’s ready, it should smell like yogurt.

You now have a starter, which is the base to the bread. You’ll need to look after it, but naming is optional! Keep it in the fridge (it will stay dormant) and 24 hrs before you want to use it, pour half of it off and feed it with 100g flour and 100g water. Leave it at room temperature and it should become active again. The longer the starter has been dormant, the more times it will need to be refreshed – the process of pouring off half the starter and replacing it with new flour and water – to reactivate. If your starter is ready to use, a teaspoonful of the mixture should float in warm water. The starter can now be used to make white sourdough bread.