Dice 1 onion, 1 carrot 2 sticks of celery and soften on a little oil. Cube 2 potatoes (add any other veg of choice) and cover in half milk half stock (reduced salt or homemade) When veg soften add chunks of fish (I do mix of white fish and salmon) then add some frozen spinach. Cook for another 7 to 10 mins.
For little ones puree, for toddlers mash, for everyone else can eat it as is. Freezes well too.