Did you "work" the plant into the full sun slowly or just throw them out all at once?
When going from inside to outside, you need to let a plant acclimate a little at a time by starting them in the shade...and sloooowly work it into the full sun.
I think what you got there is a pretty good case of sunburn.
I don't really know what to do about it...Maybe put it back inside for a while and it'll come back for you.
Hope this helps....Keep us tuned in...would like to see how it works out!...........................J