I'll probably just try it with specialty malts if I brew it again. Don't really care for taking a break in the brew day to boil a side job several hours.
Can you just keep boiling the side car until it's concentrated enough? I mean, you take the first runnings, boil it and boil it and boil it. At the same time, do your last runnings like normal, chill it, let it hang in the fermenter. Then when the syrup is done, dump that into the fermenter? Then pitch yeast if it's a good temperature?
I ask because I'd like to try this without the brew-day break.