Is there a way to make compressed watermelon without a vacuum machine? I've got in mind to make a dish with compressed watermelon, but I don't have access to a vacuum machine. I've tried once using weight, but it just cracks because the pressure is all from one side. Thoughts? If not, can it be done with a home vacuum food-saver type device instead of a restaurant quality vacuum machine? What about denser foods such as canteloupe or cucumber?
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