Minecraft

Very easy. Step one: find and kill rabbits until you get meat. Step two: make a furnace out of 8 stone. Step three: cook the meat in the furnace using coal or wood products as fuel. Step four: eat the meat. (if you can't eat the meat then your food bar is full and you need to run around to make it drop. The food bar will NOT drop on peaceful so increase the difficulty to easy or harder to eat)

Edit: Comments are telling me it does not need to be eaten and therefore can be completed on peaceful. Thanks for the comments guys!

I found a rabbit by creating a world, go to the advanced tabs, then select templates on the right, and pick desert village (translated by myself, it may not be the exact name). The seed is 1738801.

You'll be in the desert, there are rabbits in the desert behind. I killed two.

Then the challenge was to find wood in the desert! Look at the sun, you'll see where it is going to sunset. Go on the left of this point, and swim to the next village. You'll find a furnace and some wood close to it, in order to cook the rabbit. Then eat it. It took about 20 seconds to unlock.