Potatoes in Mars?

Hi, everybody!
It's almost spring here in Joensuu and we are eagerly waiting to see this year's first flowers to bloom.
In the meantime we decided to do some plant-growing of our own - our newest concept includes potatoes, oat and barley. If all goes well, astronauts in Mars might be able to enjoy a
Currently we are testing which one is the best, good old regular soil or an artificial growing environment.
We haven't forgotten about the insects either. Earlier we tried to find the best way to make food out of insects but now we are trying to make food for them. The plants we chose are supposed to feed bugs along with astronauts.
What do you think, do grasshoppers prefer mashed potatoes or porrige?