Like most families, we always cook far too much veg for Sunday dinner.
What I do is put all the veg we don’t use into a saucepan and mash it up with some salt and pepper. Then I use a square food press to portion up. Then just pop into the freezer and use as and when.
To heat up I fry in some oil to get a bit of colour and crisp the edges up a bit, then pop into oven on 200°c for about 15 minutes.