Say you need to brew a 1L starter.
Is the 1L measurement pre or post boil?
For example, You'd add 100 grams to a flask and fill up to 1L with water, then boil 15 minutes, then take note of the volume. In my experiences, after cooling down and whatnot, I'm left with somewhere around 750ml of starter.
Should I be adding extra water to ensure I end up with 1L?