I neither use sugar nor do I have a freezer. My favourite way of preserving fruit is drying and the quickest way of drying fruit in an oven is by making fruit leather…simply boil the fruit to sterilise and mashing as you boil, then pour into an oven tray and dry for a few hours at about 40C!
Have just finished a batch of redcurrants (rips) and raspberries (bringebær). The raspberries were both wild red raspberries, an old Norwegian yellow (gulbringebær) and a cultivar “White Russian”
See last year’s blog on raspberry / bilberry leather here: http://www.edimentals.com/blog/?p=13187
12th August Added pictures of leather made from cloudberries, bilberries and wild raspberries!