I just did this. I used some older 2 row and made 3 gallons of wort. Boiled it for 45 min. Cooled it and came out at 1.045. Used it to step up some 2124,860, and a really old tube of 036. Worked great, but a lot more time than DME. I did adjust with a little acid. Under up going low, yeast didn’t seem to mind.
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