Which innovative ingredient technology was first used commercially in 2019 to create the 'bleeding' effect in plant-based burgers that mimics rare-cooked beef?

Plant-based food alternatives have revolutionized the food industry in recent years. Companies have invested billions in research and development to create products that mimic traditional animal-based foods in taste, texture, and nutritional profile. This poll tests your knowledge about a significant product innovation milestone in this rapidly evolving sector of the food industry. How well do you understand the technological breakthroughs behind today's most convincing plant-based alternatives?

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Leghemoglobin (heme) produced through genetically engineered yeast
Beet juice extract with modified anthocyanins
Mycoprotein infused with iron-rich algae compounds
Fermented red koji rice with enzymatically activated proteins