I was delving into the freezer and cupboards for stuff to cook with yesterday and it suddenly dawned on me I was using things I had only made to deal with crops or leftovers .
Roasted garlic puree - mine all started sprouting, so as well as preserving some chopped and fresh in oil, I cut the tops off the remaining bulbs, roasted them whole with some olive oil, then squeezed out the puree and froze on a tray in little lumps. They are bagged now and a couple of lumps retrieved yesterday, defrosted and spread over a leg of lamb before roasting took it to a whole other level. This is now on my 'must make every year' list
Mixed citrus juice cubes - I make these in an ice cube tray whenever we have fruit going over and then bag them up. I think I got a mix of lime and orange yesterday, but somehow the mix of flavours seems more intense than a straight juice and adds a real freshness.
Chilli oil - If I have fresh chillies going over, they get bunged in a jar and hot oil or vinegar is poured over them. It has turned basic cheap sunflower oil into a brilliant flavoured oil that would probably cost a bomb to buy
There must be more ideas people have tried that we can all share (and nick of course
)