This recipe is not so much a way of preserving them as a way of making them a lot more popular (although it will last a long time in the fridge if someone doesn’t eat it first, which is highly unlikely because it is seriously delicious, for example on rye bread with cheese or in pitta bread with hummus, mmmm.)
This is one of my all time favourite meals, deceptively simple: Roast Vegetables as Themselves. It’s simple, fast, cheap, and if you use fresh vegetables in season, amazingly good.