I had planned to brew an ESB last Sunday but had to call off the brew for SWMBO. I pitched my WLP002 into slightly less than 2Q / 4oz DME last Thursday. I shook it regularly and there was active fermentation, but it's obviously done by now.
What can I do to reactivate this yeast? It's been sitting outside in 55-75* weather for a few days. I thought I would decant the old wort off the cake (I'm using a 64oz growler/aluminum foil), and repitch 2Q/4Oz DME wort back onto the cake. Do I need to cold crash it? Will that work?
Thanks for your suggestions!