The above is misleading. Fish should never smell fishy, and there was a worrying waft from the pack I opened one evening for dinner. I always feel guilty wasting food, even when there's no choice. I suppose it's partly because we can't afford it, but partly because it seems so excessive just spending money and throwing it away s if you have no regard for it.
Anyway, the solution to the problem was meatballs.
Leftover mashed potato with sweet and normal potatoes (about one and a half tubers in total)
500g beef mince
large onion finely chopped
salt and pepper
carton of passata or tin chopped tomatoes
Combine the mash, mince, onion, egg and seasoning in a bowl and mix well
Sprinkle a layer of plain flour onto a plate, and take walnut sized balls of the mixture and roll in the flour
Heat the oil in a high sided frying pan,and brown the meatballs for a few minutes
Add the passata or tomatoes to the meatballs and simmer for 15-20 minutes
We ate these with plenty of parmesan cheese, and wholemeal pasta. I prefer using chopped tomatoes for the sauce, it gives a fresher feeling ... you can also use pure sweet potato mash for an altogether sweeter meatball - I've often thought this would be lovely with lamb mince, mint and cumin. One to keep by for the spring perhaps.