Mars astronauts won't have to hold the fries: Space food technology.

TL;DR
The European Space Agency (ESA) has conducted experiments that show that frying works even in the microgravity experienced in space. The research could help determine what cooking processes and food will be available to astronauts as they explore alien worlds. The experiments were conducted during two ESA parabolic flight campaigns, in which an aircraft flies in repeated arcs to create brief periods of weightlessness. The team discovered that, soon after a test potato was added to oil in low-gravity conditions, bubbles were able to easily detach from its surface rather than coating and protecting it.
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