Kids dinner time struggle question

The last few days our kids have been fussy and not eating all their dinner and so I started to say ok that’s fine but you have to at least eat all the veggies and they said ok and went on eating their last bit of veggies and then their dad said “no they have to learn to eat what we give them otherwise it’s wasting food” which I do get too and I only give them a small serving so I know there not full but I do see his side too. What do other mums do when kids start saying they don’t want anymore? Thank you in advance