While you are waiting for the dough to rest, you can feed you starter to go back into the fridge
Firstly, you want to keep 150g of starter in your container to feed and no more
Secondly, tare your digital scales before putting your container onto it
Thirdly, add the weight of your container (if using a 1 litre Decor round container like I do it is 60g without the lid) to the 150g of starter you want to keep which = 210g (if you are following my process you would have weighed your container before using it to house your starter)
Then place your container with starter inside on the scales and see what the weight is
Use a spoon to remove excess starter until the scales measure 210g ... you now know you have 150g starter left in your container
Feed your leftover starter 60g rye flour and 90g filtered water and stir vigorously until well combined
Scrape around the sides of the container so that it is relatively clean, and again make a mark on the outside with a non permanent market pen on the level of the starter (you are only marking the container to give you feedback on what your starter is doing whilst in the fridge ... it will sometimes rise a little but that tells you it is very happy which is good to know)
At the same time mark today's date on top of the container so you know when you last fed it
Put the container back into the fridge until you need to use it next time
You are now ready to finish the final step in Day 1