What is the only food that astronauts do not have to treat and dehydrate when flying in space?

Is water considered a food?

Orange Tang?

Pecans:..soo good. But I guess they can't have them in a pie?

Pecans is right. Thanx d.girl. I found a couple of sight in reference to it , here's one.

Dehydrated water takes very little room in a spaceship. Still for some reason they don't use it.

ooops my link didn't work.

Important as the Pecan was in the diet of the ancient American Indians, space-age nutritionists have also recognised its unique properties. In the early 1970s Pecan nuts were the only natural fresh food included by N.A.S.A. in the diet of the astronauts in the Apollo missions thirteen and fourteen..

Many sites are claiming that pecan is still the only one nowadays.