my younger hounds beg for broccoli stalks when I'm preppin a dinner....they also love banana, apple and strawberries....
I do feed mine some veg in with their raw diet, but I cheat and buy frozen mixed veg, and let it defrost with water, and then whizz it up in a hand blender before mixing it with the meat etc....they love it

if we eat cooked veg with a roast dinner I cook enough to feed a family of 6 and they get their share too.....(there's only 2 of us 'oomans at home)
but anything other than grapes, onions is ok
....the most perfect creature of Heaven....