Croissants Crumb '100% Sourdough and Yeasted'
8cm x 28cm +\- In a mixer Mix Flour/Water/Starter until it comes together and rest for an hour Then add Sugar and salt then continue mixing and while mixing add butter gradually and continue mixing for about 8 minutes or more. Move to a clean bowl and let it ferment(might take 4 to 5 hours or more depending on the room temp) when you see bubbles underneath or pockets of air or 50% doubled then start to flatten the dough to a square shape using a cling wrap or baking paper and a rolling pin. leave in fridge for 1 to 2 hours.
Source: thefreshloaf.com