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Juliana Kim

The special ingredient for Mars travel meal prep? Astronaut breath

Mars NASA Earth

The process produces a protein-shake like texture that can be dried and used similarly to seitan, a popular protein substitute for vegans. (Air Company)

The ingredients for space yeast are fairly simple.

"Astronaut breath, water, yeast starter, electricity, a rolling pin and we can make it happen," Stafford Sheehan, a finalist in the NASA-sponsored Deep Space Food Challenge, told NPR.

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