Which ingredient was the key innovation in Impossible Foods' meat alternative that allowed it to 'bleed' like real meat?

Plant-based meat alternatives have revolutionized the food industry in recent years, with innovations that appeal to both vegetarians and meat-eaters alike. One particular product made headlines in 2019 when it debuted at fast food chains, introducing millions of consumers to next-generation plant-based proteins. Test your knowledge about this significant product launch that changed the conversation around alternative proteins and helped mainstream plant-based eating.

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Soy leghemoglobin (heme)
Beetroot extract
Pea protein isolate
Methylcellulose