Place the starter , flour and water into a stand mixer bowl
Whisk to combine, cover and set aside overnight
Day 2
Add the flour, water, milk and salt to the refreshed starter
Using a dough hook mix until a dough forms
Then knead on a low speed for 10 minutes
Cover and set aside for 4 hours
Tip the dough out onto a well floured surface and gently knock back
Shape into a rectangle, just slightly narrower than an oval proving basket *
With the short end facing you, use a scraper to fold the top edge to the middle
Gently press the seam down and then fold the bottom edge up to the middle
Gently press the seam down and now turn the dough to face you lengthwise
Fold the dough in half, and seal the edge using the heel of your hand
Place the dough seam side down and now seal up the edges using the sides of your hand
Dust the top with flour and place it seam side up into your well floured proving basket
Cover the dough with a shower cap
At this stage you can place it into the fridge to prove overnight
Leave the dough to prove until it passes the probe test - between 2 - 3 hours on a warm day
Preheat the oven to 230° Celsius
Tip the dough onto a lined baking sheet so the seam is facing down
Place into the oven and bake for 10 minutes
Reduce the temperature to 200° Celsius and bake for 30 minutes
Remove from the oven and leave to cool completely on a wire rack before cutting
Notes
* if you don't have a proving basket you can use a loaf tin - you will need to divide the dough in half to fit into the tin. I used a tin for half and a round proving basket for the other half. I left the dough that was in the tin in the fridge for 3 days before taking it out to bake. I left the dough to come up to room temperature before baking.