It's becoming clear over at the No Impact Experiment that the primary cause of waste for most of us is food packaging. On top of this, there is also the issue of food miles- the distance that foodstuffs travel to make it to our plate.
Currently it is impossible to find local, unpackaged replacements for the majority of foodstuffs, although it is possible to bulk out our meals with lots of local vegetables.
We are however beginning to grow some of our own food, whether it is on the window sill, or outside. This year we had a runaway success with butternut squash. We did not plant 'the crop', we merely used compost from the compost bin, and it seems that the hollowed out seeds from a shop-bought butternut squash that had been composted enjoyed coming out into the Devon sunshine...
Unfortunately we're moving rapidly towards winter. My second water melon didn't grow to full size...!