Store-bought and restaurant sourdough is FAKE! Ben Starr, the Ultimate Food Geek, explains why virtually EVERY loaf of sour sourdough you've ever tasted is actually fake, and that you shouldn't expect your homemade sourdough to taste sour. But for those of you DESPERATE for fake tartness in your homemade sourdough...how you can achieve it, using the fake techniques the bakeries use.