Why does Vegan food taste bad?

Good question. I don't know. Maybe because it doesn't have meat (or tasty) products. Yesterday I started to make Vegan Bean Taco Filling. Burnt it. And started again. The result? (Look in the bowl.)
No, it isn't crap, it's a half-eaten vegan taco. Or a grossco. I don't know why vegan food tastes bad? But it does. And it does resemble poo.