Is there a way to make compressed watermelon without a vacuum machine?
Haven't tried it but here:
http://newmountaincookery.typepad.com/a_new_mountain_cookery/2008/06/compressed-wate.html

The link suggests the following technique:


Vacuum seal pieces of watermelon (if
you don't have one, just put it in a
ziploc bag and take out as much as
the air as possible)
Freeze it overnight
Take it out and thaw