I was instructed to use 10g - I'm still new to baking but happy to trial it, was using the 'Learn how to bake' book written by Paul Hollywood.
Ahh - now there is an interesting question.
I was instructed to use 320ml of tepid water. 2 parts boiled, 1 part cold tap water. IIRC, I used the lot, maybe this had an effect. I did wonder if I'd knocked it back too much, after the 2nd prove I did kneed for 5-10 mins, got carried away - too much?
10g of yeast is perfect for that weight of flour. You could use less and leave it overnight, but that isn't necessary for what should be a straight forward bread. Whilst a sourdough starter is great and makes some superb bread, it can be a difficult beast to tame for some.
The ingredients and instructions in the Paul Hollywood book should result in a good end product. Some people may not like him because of the way he is on GBBO, but he does know what he is talking about.
I've never used boiled and tap water together, I always use tepid tap water. You say you used the lot but that isn't a problem, sometimes you need more water, sometimes less. It is absolutely to do with the consistency of the dough. You can be precise with the other ingredients, but the amount of water is something you'll have to judge. Did you weigh the water or measure using a line on a jug? I used to use the line on a jug, then I started weighing it and realised that the lines aren't that accurate at all. Of course, as mentioned previously, you'll still have to judge the correct amount that you need to add, but weighing it will give you an idea as to how much you have actually used.
Knocking back the dough should take no more than a minute or two really. As soon as you feel the air has been knocked out of it, stop. Multiple proves can help more flavour evolve in the bread, but knocking back between each prove shouldn't take long at all. 5 to 10 minutes is perhaps excessive.
For simple breads like this, I:
- Combine the ingredients
- Kneed for about 7-10 minutes
- Cover it and let it rise until it has doubled in size. Usually around an hour, perhaps up to 2 hours depending on the room temperature.
- Knock it back which takes about a minute.
- Shape it and put on a baking tray or in a bread tin. Put it in a plastic bag and let it prove for about an hour
- Bake
- Eat with plenty of butter!