I thought I'd do an update post on this thread: Thank you all for your helpful advice, we're enjoying delicious sourdoughbread here!
The things I've learned and am doing "right", that help in transitioning from turtleshell stone bread to sourdoughbread heaven are:
- the starter needed to be runnier (= like pancake batter indeed) than mine initially was, and I need to use more of it per baking session. No worries, I'm topping it up in the daily feeding sessions too, now more generously than in the tentative beginnings.
- I was first using baking paper over baking tin and putting the loaves there to 'rise'. Well, they flooded and formed a sad glob. I'm now plopping my dough balls into a pregreased forms. Both forms are glazed earthenware, given a light brushing with some olive oil.
- then a cling film goes on top to keep the moisture in. Initially I was using a wet tea towel, but on the winter-dough-rising-spot aka on the mass of the rocket stove, the teatowel dried during the...
- rising time: depending on temperatures, but 'through the night' seems to be a good average.
- the oven is at 225 degrees Celcius. Before the loaves go in, in their baking forms, I spritz them lightly with water.
- still cooling them under a tea towel.
The sourdough starter has become better - more vigorous and more delicious bread - over time. Et voilá, the result!