So I've recently tried some sour beers that I really liked. The first was The Bruery's Oude Tart and the other was Petrus oak aged pale ale. I am interested in making a sour beer now but I am wondering how sour those two beers are so I can approach making a sour similar in sourness to those. Any help would be much appreciated. Also any recipes that would be similar to either one of those would be awesome. Thanks!!!