I've researched a little and read a few mixed descriptions about Brandywines (directly related to this hybrid tomato). Some have described it to be mildly sweet or generally sweet. But mine ended up hitting me in the face with such an aggressive sourness that reminded me of a lemon! It wasn't until the aftertaste that I noted the typical tomato flavor with a very faint sweetness. The soil I used was a potting mix (these tomatoes were planted in 5-gallon pots) by Miracle-Gro. My mom took care of them while I was away for two weeks, and she told me they started getting blossom end rot, and that brought her to add two tablets of Tums into the soil (two per 5-gallon pot). Is there a particular reason why they might have turned out so sour? Is it the Tums?