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The magic ingredient in Silicon Valley's favorite 'bleeding' veggie burger is under fire

Today's veggie burgers can be described with a handful of delicious-sounding adjectives, but "meaty" isn't one of them.

At least it wasn't — until Silicon Valley startup Impossible Foods began creating a meat-free burger that tastes disturbingly close to the real thing. The meat-like flavor can largely be attributed to an ingredient called heme — the magic spark that even allows the Impossible Burger to "bleed" like a real burger does.

But that magic spark may be poised to ignite a fire.

Read the rest on Business Insider.