I'm relatively new but I've brewed 4 batches now, all extract, which have turned out pretty well so far. I recently tried a sour stout (Madrugada Obscura by Jolly Pumpkin Artisan Ales) that made me really want to try to brew a sour beer. I apologize in advance for my inexperience, but is there any way to brew a sour beer strictly from extract (which I'm familiar with) or do I need to do at least a partial mash (which I don't fully understand). Thanks.