Just layer the food item in a single layer on
the sheet.
Place in
your freezer as level as possible.
Remove from
freezer 8 - 10 hours later. Immediately Break
up the items and put into a zipper type FREEZER
bag.
And put back
in the freezer.
Now when you
want some of the blueberries, or whatever, they
will come out of the bag individually so you can
take out a little or a lot.