The first food eaten in space was pureed meat (beef and liver paste) and chocolate sauce, squeezed from tubes. This meal was consumed by Soviet cosmonaut Yuri Gagarin during his historic flight on April 12, 1961, according to Orbital Today and NASA. The tubes were used because early space missions were too short to require extensive food preparation, and the pureed consistency and packaging were chosen to prevent crumbs from floating around the spacecraft.
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