I have recently started mashing fair quantities of base malt along with my specialty malts and then adding a bit of extract in the end. Quantities of 25+3 kg all together with 2 kg being base malt.
The first two beers which are ready have both had this "wine" taste which I have earlier tasted in kits with a lot of simple sugar added. None of the two beers have had any simple sugar in them.
The only possible culprit I can see is that I have been having a hard time keeping my mash temperature up, which means that I have dropped down to 140 and then added boiling water to get i back up again.
I have mini mashed before (just specialty malt a a bit of base malt) and I have not had this taste before.
Both of my mashes have been fairly ineffective at around 55%.
Any help will be greatly appreciated. I brew BIAB stovetop by the way and the beers have been fermented at around 19 celcius with Nottingham and US-04 dry yeast.