I'd eat tofu. So many ways to cook that stuff, and I recently found out how this awesome restaurant near my place makes it. Before that, I wasn't a big fan, but now it is my favourite food.
Take a package of extra firm tofu. Freeze it for about a day, defrost it in boiling water for 15 minutes (all while it's still in it's original package), remove it from package, cut it up into slabs, place a heavy weight on the slabs for about thirty minutes or so to remove most of the water, cut tofu into cubes, marinade for about an hour in whatever sauce you like, dust it with something like nutritional yeast or corn starch, or whatever, then shallow fry or deep fry the hell out of it...
Healthy, extremely inexpensive, tasty, and easy to make (the entire thing is done in steps where you don't need to pay much attention - except the frying part, obviously).
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For a nice, healthy snack, take a blender and a block of soft tofu, and something to flavour it with (like some strawberries, honey, or whatever else). Toss everything in the blender, and blend until it is all goop. It's like this pudding/jello/mousse hybrid. Good stuff.
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If not tofu, it would be whatever kind of grain I could get my hands on, tossed into a spice/coffee grinder to make a meal (which is like cream of wheat). Very cheap, very healthy.