Last sunday we brewed a couple of black porter batches with my buddies and we used a generous amount of roasted barley with pilsen malt. We put it into the frigde as soon as we finished mashing, as we did the brewday before.
I have arranged with a local bakery to give them my spent grain for them to bake over a few days. The problem is that last time our spent grain smelled nice all the time (Amber with caramel malt, pilsen and a bit of brown malt) but now it has a funky smell all over it (brown, chocolate malt, roasted barley and pilsen). Today, when I opened the bag to inspect it, it smelled alright but when you pry it arount the funky smell comes up.
I made some malt cake a cuple days ago and it was alright. I'm afraid to deliver this spent grain now because of the smell. I tested a little sample in the oven and I kindof hint the smell comes from some natural compound in the roasted barley, but that's just a hunch.
I will test it tomorrow morning by baking malt cake again and see if it tastes good, or whatever.
Any idea why it smells weird this time?